user
Presidential Heating & Air Conditioning, Inc.
8000 Cessna Ave, Gaithersburg, MD 20879, United States
Appearance
Presidential Heating & Air Conditioning, Inc.

Comments
El
Review №1

Ive found Presidential to be reliable and trustworthy. I never feel like Im being upsold. I love how they send a name/photo of the technician in advance so that you know who will be knocking on your door.A couple of years ago, when a technician did a less-than-adequate job installing something, I called about it, and Presidential sent someone else out right away to remedy the problem. They were apologetic and honest, and I appreciated that above anything else. Sometime s**t happens -- when it does, you own it, apologize for it, fix it and secure the relationship. Presidential seemed to know that, and I appreciated it. Good people .

Al
Review №2

Very clean and neat!! Cleaned up loose wires and area looks better than when we first moved in. Not to mention they did all this work as the tropical storm was moving in. Rain did not slow them down one bit! Very careful of our carpets all floors! Thank you!

Pa
Review №3

Presidential responded immediately and sent a service person, Simon, who arrived in 40 minutes. He diagnosed the problem and suggested a service person return the next day, after the ice melted. The serviceman, Juan, came today and inserted an injection of freon that allowed the air conditioner to run until a replacement for my very old system is installed. All great advice given promptly during one of the hottest days this summer. I am grateful to them for their excellent service and highly recommend them.

Fi
Review №4

I had a new heat pump and air handler installed through Presidential Heating & Air. I was very happy with my experience. After an assessment, I was offered several proposals. Marc answered my questions, and explained the options. On installation day Humberto and his team were on time and did a fantastic job. The team was very professional and clean. I appreciated that they kept me informed during the process and walked me through how to operate the new system. I would highly recommend Presidential!

su
Review №5

5 star company. Their entire team is excellent. Especially Marc. He is technical knowledge and extremely professional . He only recommended the system that customer needs. I had total 3 quotes from different companies. I end up choosing Presidential to replace my AC and heat . They came to do the installation yesterday and went very smoothly. I am very happy with my choice to use them : )

Je
Review №6

I cannot say enough about Tim and his business. I have a hair salon that has needed minor to big last minute emergencies. Tim responds within minutes no matter what the issue is. Whether it’s Tim that has come to do the work or any of his other guys, they are all so professional and efficient. Cj is someone that has helped me out many times. Even at my own house when we had plumbing issues. It’s so nice to be able to trust who your working with and not be taken advantage of. They are the best of the best.

Yi
Review №7

John did a great work for the heater and AC maintenance and is easy to talk.

Da
Review №8

Presidential is a pleasure to work with. The office staff is pleasant and helpful. They make every effort to accommodate your scheduling needs. They are very clear about costs and what is covered. The technicians are knowledgeable and willing to go into as much detail as you like explaining the problem and options for addressing. I will continue to use their services as highly recommend.

Gr
Review №9

When my 15 year old Carrier Infinity Control screen went blank, I contacted Presidential. Gina was VERY responsive and scheduled a tech for later that same morning. Andy came early and confirmed the thermostat had failed. Andy went to pick up the unit, came straight back and installed it. We were up a running on a hot day within a few hours. Great work, folks!

Mi
Review №10

The service technician was very methodical in diagnosing our problem (no cold air), and he efficiently identified the source of the problem -- a worn out capacitor. He replaced the capacitor, and the A/C system then functioned properly. He was informative and answered all my questions. Top notch.

Bo
Review №11

Personable and capable service tech. Quickly diagnosed the issue and he was able to return the following day to perform the repair to a PTAC unit.Thank you Simon and Presidential.

M
Review №12

I cannot say enough AMAZING things about my experience from the first phone call to the gratitude for our incredible technician. ONLY use this company as they will treat your home like their own. And treat you as a customer like human and just a new file in their database.

Sc
Review №13

I just started my annual maintenance contract with Presidential HVAC. Simon came by and performed a furnace checkup and walked me through everything on my system and controller. So far I am extremely pleased with the professionalism and friendliness.

Da
Review №14

Andy was certainly on time, worked efficiently, made a suggestion for servicing the AC that he highly recommended. Took care of it and was on his way. As usual I was satisfied with Presidential. I have been with them since the early 1980’s and have never had a problem.

Ch
Review №15

The service tech for Presidential Heating & A/C was polite, knowledgeable, & professional. He knew exactly what to test & replaced the correct part immediately. Thanks to Presidential for a prompt emergency repair visit to our home in Rockville during a hot August weekend.

Me
Review №16

Andy was polite and professional. He took the time to answer all my questions and replaced the capacitor for our AC unit. Great service, reasonal prices!

Th
Review №17

Technician arrived within the promised window. He identified and quickly resolved the condensation issue. He also pointed out other potential issues that might crop up in the future.

Sc
Review №18

The team at Presidential was able to get us in for a last minute service call. They had our broken part ordered and ready for install the next day, and our tech came back right away to finish the work. They did everything to minimize our downtown and give us transparent information about the process. I wont use anyone else ever again!

Ag
Review №19

My AC quit, during the middle of a heat wave as usual. Presidential sent someone out first thing in the morning (I could have had them come the night before but decided to save the extra emergency response fee). The technician (Andy) was prompt, courteous and professional and got the job done quickly. Ive been a client of Presidential for years and intend to continue

Jo
Review №20

We are very pleased with the work performed by Tommy in getting our A/C running again. He quickly isolated the problem and did a temporary fix to get us to cooling again. The fan center was faulty and needs to be replaced. He will get us a price on a new fan center and other parts that need to be replaced on a 30 year old system. He also recommended not sinking money into this old system and has arranged for us to get an estimate on furnace replacement and possibly replacement of our 15 year old A/c unit.

Vi
Review №21

We had our AC break in the middle of the Summer. They came on a Saturday on time early in the morning. They were professional and polite. We had another issue about 1 hr after they left and they came back that same day to repair it absolutely recommend it!!

Ti
Review №22

Mike was professional, personable and efficient. I will definitely use this company again

Ka
Review №23

We needed to install a new Furnace (Heat and Cold) and did call several known companies in the DC metro area to get an estimate. Presidential Heating & Air was far beyond all competitors in all aspects. The salesperson arrived on time and at no cost to us. He did a through technical evaluation of our needs including precision sizing for the new furnace. During installation four highly skilled technicians arrived and did a magnificent installation of the furnace and a new Wi-Fi thermostat that we had purchased from Amazon. When finished, they thoroughly clean afterwards. The furnace they recommended for us was Carrier brand. It is working perfect and every part including hoses and valves are brand new. I must mention, that prior to salesperson arrival all the way to the last steps during installation we received emails and texts to let us know the status of the project. The pricing was highly competitive and they even provided attractive financing plans. Presidential Heating & Air is 5 STARS and highly recommended. As a final note, I built two homes and I have seen my fair share of AC/Heat companies. Very positive experience and pleasantly surprised.

Ra
Review №24

Our AC blew out last night and right before what will be an exceptionally hot weekend. It was super easy to get an appointment scheduled via PHAs chat feature with Penny, despite being in the late evening, and we got an appointment for the next morning. Juan, our technician, was super friendly, professional, and a clear communicator. He quickly identified the problem, gave a range of solutions (since we had an old AC unit), and was honest about what he thought was the appropriate solution. Overall, our issue was quickly resolved and with excellent customer service. We are also members of their service plan and the technicians who came by to do check-ups on our heating system last Fall and AC this past Spring were similarly professional and courteous. We will definitely be using PHA in the future for our HVAC needs.

Si
Review №25

Tommy Grey was great! He gave me a very detailed feedback and nullified the outrageous proposal to redo all my systems by another company, which we already dismissed! He was most helpful and personable!

Ca
Review №26

George was friendly and professional, taking the time to explain what he was doing. Excellent service!

Ma
Review №27

I had such a wonderful experience with Antonio H! He really represented his company with exceptional manners and work. I really appreciated his efforts in explaining updates to my system, how to effectively use my system, and asked if I had any questions. He spent the time to get the job done well, and I could not be happier with my experience.Thank you Antonio!

Br
Review №28

A bearing in the motor of the fan in our air handling unit failed. After being diagnosed the technician replaced the fan after the part was received, about 3 days later. The technician was courteous and efficient in his work.

La
Review №29

Very satisfied. Everyone we dealt with was knowledgeable and friendly. Communications were excellent at every step of the process. A very professional operation and a pleasure to work with

Sc
Review №30

I saw that Presidential had great reviews so contacted them along with a few competitors for an estimate on a mini split HVAC unit. Their price was competitive so combined with great reviews, I opted to go with them.Three highly professional gentlemen showed up precisely on time and I got an immediate sense that I would be taken care of. And indeed, they were knowledgeable, respectful of our home, and cleaned up as they were leaving. My interaction with the sales representative was also highly positive who accommodated my small requests as the mini split HVAC was going into a renovation area of my home.The mini split HVAC is working great as advertised. I could not speak more highly of Presidential. In fact, when the time comes to replace our homes primary HVAC system, I will certainly contact them.

Na
Review №31

The technician was awesome. He came out on Friday evening. I called them around 5:00 pm

Lo
Review №32

George was excellent, performed my service with speed and efficiency. Couldnt be more pleased with Presidentials sales and service.

De
Review №33

Installation was very efficient and professional. City inspector approved it after very brief visual check. Only issue was that the follow up documentation was slow.

De
Review №34

I can always count on Presidential for all my HVAC needs. They’ve been my go to company for years, I highly recommend them.

Ma
Review №35

Weve had a contract with this company for over 10 years. We have always been very pleased with their responsiveness, their quality of service, and their professionalism! Highly recommend Presidential Heating and AC, Inc.!

Tr
Review №36

Everyone was so friendly and courteous. They arrived on time and cleaned up everything as if they werent even here. The preferred customer pricing is great and we will continue using Presidential.

Ar
Review №37

Yesterday on a Saterday my heat pump air conditioning stopped working and the technician arrived about 2 hours after my call. Although he did not have the parts for a final repair he was able to make a temporary fix to restore air conditioning on the initial service call. I have been a Presidential customer for over 10 years and have always been very satisfied with the service.

Ma
Review №38

It was pleasure working with Glenn Hoffacker. He gave us several options for the heating and air conditioning replacement system with a great price. They had a good team who did an excellent job installing the system. I certainly recommend Presidential Heating and Air Conditioning Inc.

Jr
Review №39

Fast response, courteous service. Tech had the problem diagnosed in minutes and fixed soon after. Thank you Simon!

Ja
Review №40

John came to do my air conditioning check. We discussed adding a fan in my ducts and I also inquired about a mini split for my sunroom. He was very helpful and explained everything in terms I could understand.

Pa
Review №41

Juan was expediant, professional, and probably most of all intelligent and thoughtful! I was perhaps needless to say thrilled with Presidential’s service and would call back in a heartbeat. And, he was a really nice man.

P.
Review №42

Excellent company. Juan does a fabulous job with maintaining the HVAC system as well as other work he has done on the system. Very professional, knowledgeable, courteous, friendly, and answers all questions. Highly recommend Juan and Presidential Heating & Air.

Yi
Review №43

Juan A. diagnosed the problem stepwise, explained each step, and made each repair expeditiously. The 18 year old Carrier air conditioner, originally installed by Presidential, is now functioning almost like new.

Be
Review №44

Service tech, Simon, was pleasant and knowledgeable. He was prompt and called 30 minutes before arrival. Great service!

An
Review №45

Wonderful experience as always. Tommy does such a great job keeping our heating and air conditioning units working.

Ja
Review №46

The technician Tommy was good. The contract I was ready to sign was not. The contract requires me to agree to auto-pay. Tommy said that it wouldnt happen if he didnt save the card information. But then, why does the company require me to sign a false statement? And I hate auto-pay. So, no contract at least for now, meaning I had to pay more money for this service than I wanted to.

T
Review №47

Presidential never disappoints!!! Everyone you encounter through this company is pleasant and professional. They excel at customer service. Juan (our tech) has been to our house several times and always addresses the issue and eases our worries. He is terrific. And Gena is awesome!!! I am super happy that we went with Presidential for our services.

Ea
Review №48

Presidential installed a power ventilator, whole house dehumidifier, and new filter housing for 5 inch MERV filters. From the consultation stage with Glen to the installation stage with Dave (and other whose name I forget), I found Presidential staff to be personable, knowledgeable, helpful, skillful, and professional. I would recommend Presidential to any one with a very positive double thumbs up!

Li
Review №49

Came between the time scheduled.Very courteous. Explained what he was doing. Also installed Air purifier.

Tr
Review №50

Great service, professional and knowlegeable technicians! Ive used them several years and they always fix the problems and make solid recommendations. Highly recommend their business!

Ga
Review №51

Tommy was great. He made sure that we knew what he was installing and answered any and all questions that we had. His knowledge of hvac systems is one of someone whos loves his job and has been doing it for years. Any thing that has to do with my heating and cooling, Im calling and asking for Tommy

J
Review №52

Diagnosed and replaced bad contactor. Presidential is a reliable and reasonably priced HVAC company. They also installed one of my central ac units.

Jo
Review №53

Courteous service as always. However, the technician did arrive about 90 minutes later than originally scheduled. However, I did receive a courtesy phone call warning about the delay.

St
Review №54

Fast fix to AC unit needing service. New parts on service truck saved time. Very helpful service rep. Thanks!

C
Review №55

Presidential was recommended by a plumbing company that did not do HVAC. I needed to replace my whole house humidifier on my furnace. The person I talked to on the phone was very helpful in determining what my options were from the humidifiers Presidential supports. They were able to help my determine that I had a bypass system and told my about the direct system the suggested. I agreed to the service and the estimated cost for the new system and service. We agreed to a service date and time. The technician called me to let me know he was on his way and when he would be there. Right on time he arrived and started working. He actually determined that my current humidifier had not been connected properly when I got my new furnace (installed by a different company). He quickly removed the old system and set to installing the new and improved system. He repaired the old by-pass and got the water flowing. This winter has been such a pleasure with a new functioning humidifier. I would recommend Presidential HVAC.

Ge
Review №56

Technicians were very courteous and professional. They arrived when stated and repairs were made quickly. its good to have heat again!

Li
Review №57

I’ve used Presidential to service two HVAC systems (one in a condo and the other in a house) and appreciate their reliable, honest services which give me peace of mind that my system will work well even under temperature extremes. I would recommend them.

Jo
Review №58

Presidential installed my HVAC system in 2005, replacing one that was more than 25 years old. Great system (Carrier) efficient, quiet, variable blower speed is very nice. They have done maintenance since then. I am very happy with their service. Service this year (2020) was done by Andy Middleton. He was prompt, efficient, and thorough. Hes a nice guy, too. Great service.

Ma
Review №59

The workers came in on time and worked hard to complete the job. We had to have a follow up visit which also worked out well. It was great working with them.

Ju
Review №60

Had our heating tune up this morning. Was notified Juan was on his way and love the tracker that allows me to see how long until he arrives. He was neat, courteous and pleasant and he performed the service quickly. We have always been very pleased with Presidential and highly recommend using them to our friends and neighbors when asked.

Lo
Review №61

Received several phone calls and texts before the person came to service the a/c, the technician was very nice, very professional and answered all my questions. I would not hesitate to use them again.

le
Review №62

Juan Albisu from Presidential Heating and Airconditioning was very professional and very helpful. He was very knowledgeable and very kind. Thank you ! Would recommend!

Mi
Review №63

Exceptional service and quality! This was our first experience using Presidential and we were not disappointment. The technician was punctual, knowledgeable, and friendly. He talked through the entire process, explained the work he would be performing that day, and answered all my questions. We were so pleased with the appointment that we decided to enter into a service agreement with Presidential. Additionally, the technician was COVID friendly and exercised all precautions during the visit. Thank you, Presidential!

Bo
Review №64

Our service provider, Andy M, was early, was very professional and very courteous. I give him extremely high marks.

Br
Review №65

John Rosewall was super helpful, explained things well, fixed our problem and gave us many tips for future use of our HVAC. Great job!

Ch
Review №66

Technician was knowledgeable and informative. His service work on our units went well. Systems are ready for summer heat.

Pr
Review №67

Antonio Herrera was a pleasure to work with and overall my experience from the moment I called to book an appointment to the service being completed was great!

Si
Review №68

Great experience — this is a very streamlined operation!I got a text about an hour before the appointment confirming the time and introducing the technician, Jack. There is even a link in the text so I could track the progress of the truck right to our door.Jack checked out our 2 systems, a gas furnace and a heat pump. He replace the filters and then showed us how to adjust the dampers and vents to even out the temperature across all 3 levels of the house.We also had iwaves installed. These little gadgets kill mold, bacteria and viruses, as well as reducing allergens, so it made sense to get them done while he was here.We also thought we needed another Thermostat but Jack recommended an alternative solution that didnt cost us anything - which I really appreciated.Id recommend Presidential.

Ka
Review №69

Always friendly, always patient with questions. Came in told us what they were doing and did what they said they would do.

Sh
Review №70

My furnace went off in the middle of the night when the weather was 20 degrees outside. I called Presidential, they sent a man out, he went to get a part needed, returned and fixed the furnace within 4 hours. Great work!

Ri
Review №71

The service provider was very knowledgeable about the systems and provided exceptional service.

Th
Review №72

Presidential has been a pleasure to work with. Scheduling service was easy. Gena is very responsive and professional. This time, we had Juan over to respond to the service. He installed a humidistat, hooked up a pump for the condensate and made sure everything worked well. Very professional and tidy. In this era of the pandemic, Juan was very observant of the mask and physical distancing regulations.

Ca
Review №73

It was easy to schedule an appointment. the text before the tech arrived was very helpful and gave a very good estimate of when they would be here so I could have a mask handy. Everyone was friendly, professional, and helped solve my heat problem.

Na
Review №74

William could not have been more professional. I was especially impressed when he took some of the work out to his car in the freezing cold to avoid making too much noise with my husband on a work call in the room next door. Thanks for the great service.

Da
Review №75

Great service by William. He was on time, thorough, safe, and transparent. He answered all my questions and was the complete professional. That’s why I’ve been with Presidential for 8 years.

Er
Review №76

Excellent service with top technicians as always

Ke
Review №77

We had a great experience with Antonio today. He was professional and thorough and explained the issue he found and did the fix!

Ju
Review №78

We have used Presidential for about ten years and are very satisfied. Just today we had our furnace check-up which included replacing one part which needs replacing every several years. We were advised in advance that this needed to be done and the cost involved. Their personnel have been unfailingly prompt and courteous. We also used Presidential to upgrade the humidifier on our furnace to a “steam humidifier.” This was done efficiently and for a fair price. As you can see, we recommend them highly.

Or
Review №79

Service Technician Juan Albisu, came to service an issue about our new Carrier unit less than a year old about water leaking. Turns out it was a clogged hose which he was readily able to fix. Juan was open/upfront, very personable and was able to communicate as what the issue was. His service was impeccable, was very knowledgeable about my system and made it a very welcome experience. I would rate him very highly as a skilled technician and welcome Juan anytime to service my home.

Ro
Review №80

Their serve techs are always friendly and explain what they are doing. Recommend highly

Ji
Review №81

I want to thank Presidential Heating and Air Conditioning for the quality and honestdiagnosis they provided and follow up service and installation. We awoke in early December to a loud banging sound in our indoor furnace. Tommy came by and diagnosed our 20 year old system with mold, in need at least of a new motor, but rationalized with us our system was on its last legs. We had a new system installed inside and outside three days later along with an Air Wave purifier to keep our air quality clean and protective of mold forming again. Dave, the main installer, did quality, efficient work, along with his assistant. Mark, our sales rep, explained the options of a “good, better and best replacement option”, and provided us with all discounts and rebates that were available. Bottom line: good people, good Carrier products, good support and customer service. We will use Presidential as our main HVAC service provider from now on, and my wife and I would recommend them highly to anyone considering who to call when they have heating, air duct cleaning or air conditioning needs. Jim and Debbie B, Gaithersburg.

Ca
Review №82

Juan was terrific. We had trouble setting our thermostat correctly and he showed me how to do it. He was fast and efficient and a pleasure to deal with

Jo
Review №83

I had an appointment for 7:30 in the Am, so we got the kids ready early and waited. By 7:45 Am no-one was here and I heard nothing, so I tried calling Presidential and when I was unable to reach anyone I called the guy who does the in-home evals, Gary. Unable to reach anyone I sent an email and then got a call back from Presidential telling me Gary was stuck at the shop and was just leaving and was running late.Gary showed up about 20 minutes or so later. When my wife answered the door she said hello and Gary ignored her and said nothing. She said hello again and he barely uttered hi in a low voice, clearly irritated. I came down and took him to the basement to show him where we needed help and he immediately began criticizing us; what we did wrong, and was oozing anger and it was very uncomfortable. I finally just asked him why he was being so hostile and he said because I called him as opposed to calling the office. I explained that I had tried both places only because we had an appointment, no-one had shown up at the appointed time, and no-one bothered to call to tell us they were running late.Gary continued to be rude, abrupt and angry, his responses were condescending and he made the whole experience very uncomfortable. I later found out that he was also rude to my mother-in-law, having ignored her too when she said good morning to him.Overall, the whole experience was really disappointing, really disconcerting and probably the worst experience with a contractor weve had in our lives, and in my own home no less. We got this company from Angies list and Angies list should be ashamed for having promoted this really unprofessional company.

Ke
Review №84

We have been using Presidential Heating for years but this was the first time that William serviced our heat pumps. William was punctual, friendly and clearly explained his overall assessment of our system. He even changed the filters. We plan to continue using Presidential Heating for our heating & A/C needs and recommend them to family and friends.

Br
Review №85

Presidential fixed broken ductwork that was missing a top piece that happened before we owned the home. They installed two iWave air filtration systems (we have two HVAC). They were on time, professional and courteous. Pricing was fair. Juan was our technician, highly recommend.

Cl
Review №86

Weve dealt, very happily, with Presidential for 30+ years. Highly recommended!

Sa
Review №87

Presidential is fantastic! They are always very quick to respond. Every employee Ive been in contact with from the scheduling department to the service department has been wonderful to work with.

Ch
Review №88

The tech came out and installed air cleaning systems on both of my units. He was on time and very informative about the device he installed.

J
Review №89

Ive used Presidential since I bought my home 14 years ago (both ongoing maintenance/inspection service and repair work) and have been extremely happy with their service, quality products and responsiveness. Highly recommend.

Mi
Review №90

Fantastic. This company has exceeded all expectations from the receptionist on the phone to the service technician. Ive been a homeowner for 5 years now and the technician today was the friendliest, most knowledgeable, helpful, and pleasant Ive ever encountered. Victor came out today on the weekend and was wonderful. Highly recommend this company!

El
Review №91

Impeccable service. Juan was just so kind, knowledgeable and most of all, professional. I highly recommend this business for your HVAC needs. Their text message service is also a great idea and very helpful.

Di
Review №92

Victor was the technician that came to our home to evaluate what was wrong with our AC. He was excellent. Knowledgeable, professional and very responsive. He kept my husband informed and thoroughly tested the entire unit. We will definitely use presidential heating and air-conditioning in the future. Excellent work.7/7/2020: Tom Gray was the technician that came to our home today. He was excellent. Very thorough and knowledgeable.

Ja
Review №93

Not super cheap, but friendly and competent service

Bo
Review №94

Prompt and professional very informative in discussions about the system and I highly recommend.

Sh
Review №95

Before choosing Presidential company, I have read many great reviews and found them accurate and true. The service I got was very professional from the sales person, office employees and the the team who installed the A/C unit. I really recommend presidential company.

Ma
Review №96

Professional service provided. Old Equipment overhaul and replacement in just one day.

Ma
Review №97

William, was very professional and kept me informed of each step of the process so I know what was happening.

Vi
Review №98

Juan did great jobs. Even better than I expected. He not only installed/fixed thermostat control. He also found and fixed other issues for me. Now my carrier AC works much better. He also cleaned my unit. He did much more than expected. He knows everything. He earned my trust. Thanks!

Sh
Review №99

Juan performed the fall heating system inspection in an extremely professional manner, and took time to keep me informed of the details of the inspection throughout. He gave me total confidence that I was getting expert service, and I feel certain now that my systems are getting the attention they need.

Ro
Review №100

On time and reliable. Highly recommended.

Information
19 Photos
100 Comments
4.9 Rating
  • Address:8000 Cessna Ave, Gaithersburg, MD 20879, United States
  • Site:https://presidentialheatandair.com/
  • Phone:+1 301-670-0851
Categories
  • Air conditioning repair service
  • Air conditioning contractor
  • HVAC contractor
  • Heating contractor
Working hours
  • Monday:7:30am–4:30pm
  • Tuesday:7:30am–4:30pm
  • Wednesday:7:30am–4:30pm
  • Thursday:8am–12pm
  • Friday:Closed
  • Saturday:7:30am–4:30pm
  • Sunday:7:30am–4:30pm
Offerings
  • Repair services:Yes
Similar organizations