Very good. Nshan had been to my house several years ago to service the furnace while he was working for another company. I originally called the previous company he worked for (starts with M like a famous inland sea or a diet) and their soonest appointment was 3 weeks out. They're kinda rude too and I looked up their recent reviews which have been low. So I called Nshan. I told him I want to keep my 20 year old ac in good running condition and don't want any pressure to buy a new unit. Unlike the prior technician from M company who couldn't talk enough crap about my "old" ac. So I highly recommend Nshan. He started his own company and provides responsive, high quality service! read more

Amazing service!! Being literally 2 days away from my due date and my ac giving out on me at 7:45pm I was so worried on how I would survive a 90 degree night ! I came across this business on yelp and I am so glad I gave them a call. The guy picked up quickly and was at my house in under 30 mins, I couldn't believe it! He fixed my ac quickly and was priced very fair. He was so honest! Thank you Nshan for saving my life! read more

Have worked with Nshan at least twice, and the last time was an emergency. He was really responsive and hustled to fix our issue. Super knowledgable and efficient. read more

During a heat wave (115F at my house) my 30yr old ac unit stopped working. With in an hour of me calling, it was fixed. It was also a Sunday. Great contractor, I highly recommend him. read more

Nshan came to the house at 7:30 in the morning after a rough night with no A/C. He was able to squeeze us in before his 8:00am appointment as we were a local, residential call. He quickly diagnosed the issue and zoned in on the unit that sits outside the house an lo and behold the Capacitor was the culprit. Fortunately Nshan had the part in his van and was able to fix it quickly. He was done by 8:00am! read more

After hours and a Friday evening we were desperate when our AC went out. It was in the 90's outside, had a house full of company including a baby. Made the call and a wonderfully knowledgeable technician was here within 40 minutes. Fixed the problem, was honorable, honest and efficient. If you need heating or air conditioning service, call them. read more

Our AC broke down last night during the height of the heat wave. Nshan actually answered his phone when I called on this sweltering Saturday. He fit us into his schedule within a couple of hours, came in, quickly fixed our broken AC, and ran off to rescue someone else! Thank you, Nshan, for rescuing us! read more

House is freezing and furnace is on the fritz. Called Guarantee and a tech was out in less than 45 minutes. Diagnosed the problem, competently made the repair, along with some solid recommendations for improving my homes HVAC system. No pressure at all. Price of repair was very reasonable and would highly recommend. These are nice, highly trained professionals who know their stuff. read more

Nshan sticks to his strong business promise of available, emergency service that is efficient and fair. It was late on a hot summer Sunday night and we were desperate for service - Nshan saved the day! In addition to being prepared with the needed part to do a one visit fix, he gave us more information about our AC than we ever had to help us prepare for good maintenance. We highly recommend Nshan and his company and look forward to counting on him for his great service for all our AC needs. read more

Nshan was my savior! He showed up last minute and was here under 30 min. Professional and thorough, our AC was fixed and running in no time! He explained everything and even suggested some things to keep our system in good shape. read more

Excellent and Outstanding Service! I am so glad I found these guys. Diagnosis rate was very fair and reasonable and technician was able to replace the faulty parts in a short time. Cost of the repairs were also very reasonable. I have this companies phone number stored in my phone. I highly recommend them! read more

I called them up on a Sunday morning as our central air wasn't working during a terrible heatwave and I have a baby at home and he was there within half an hour. Luckily it wasn't a serious issue he had it up and running that day. His rate was very reasonable especially since he had to come on a Sunday. I would definitely recommend him to others and use his company again. read more

I called 3 installer before calling Guarantee Heating .... all of them tried to sell over needed equipment with a high price tag, also i called Costco, Homedpot , Lowes and Sears, their prices were ridiculously high for the same unit number, NEVER NEVER try those big guys, they charge almost double, the big guys wants $11000 for my unit to change , and i end up paying almost $5000 to Guarantee Heating Co. So professional , and ontime, also i surprised for their extra services that was not even negotiated for free. Thanks Art La Crescenta, CA read more

I am SO glad I found Nshan and Guarantee Heating Air Conditioning and Refrigeration! I own a business in Atwater Village. As a renter of a commercial space the idea of replacing a unit is daunting. Especially when it seems the unit might be simply in need of a repair, not replacing completely. Finding someone honest was almost as daunting. But Nshan arrived. Assessed my system, explained in detail the problems and what might or might not occur, he replaced a couple of parts and my business is perfectly cool and I don't have the stress of having my customers uncomfortable. I also don't have the stress of the system, "providing air and then providing only fan". I am truly grateful. WOW! Thank you Nshan... :) read more

We tried calling several HVAC repair companies first thing in the morning, and Nshan was the first to pick up the phone. He squeezed us in and was at our front door within 20 minutes! He diagnosed AND fixed our A/C problem in 15 minutes. We will definitely call him again for any future HVAC needs! read more

Guarantee is professional, quick, clean, honest, and fairly priced. Nshan came in as a second opinion for my a/c where the other person told me the whole unit had to be replaced. Nshan was able to repair what the other guys couldn't. Bonus: Guarantee is available on Sundays!!! I had such a great experience with the a/c repair I called them when my dad's heater went out. It's cold nights and I was worried about my dad having to spend another night without heat. Nshan showed up within 30 minutes and took care of the heater. Great service!! read more

I own a retail business in Glendale and today I opened up the store and found that the front ac unit was not operating. This unit cools the part of the store with a total window front, and the inside temperature was 88 and rising as the heat streamed in through all those windows. I called six places and got offers from 2 days from now up to 2 weeks from now. Wrong time to lose your ac. I called Guarantee and within 2 hours Nshan was at my store. He worked with me to ensure the problem was correctly identified (appeared at first to be a simple battery fix but it was a intermittent thermostat to battery connection). His price was fair and he was pleasant to deal with. I would definitely use him again. read more

Nshan is very professional and thorough. Old school integrity and really is very knowledgeable regarding all of the HVAC ins and outs. SO glad I finally found a good one. Highly recommend! read more

In the middle of the most intense heat wave in years, our AC goes out. We call at 7:30 am. They arrive at 10 am. Repair is complete by 10:30 am. Cool air. Great service. read more

I was referred to Guarantee by another service company that I use for my business. Nshan was very professional, and I didn't feel like I was being gouged. He resolved my immediate problem quickly. Guarantee will be taking care of my air conditioning from now on! read more

Nshan worked over and above my expectations with honesty and integrity, So I don't think you can go wrong.

I couldn't be happier to find this air condition service that actually shows up quickly, gives a fair price, and does an great job. I actually felt like he was trying to the best job for the best price, and wasn't trying to exaggerate the problem and maximize the price. The owner Nshan seems truly honest and with integrity. I used him once and it was great. I have called him again and he is working on a new bigger problem on a commercial property I have and it is going well. What a relief it is to have an honest, competent company to contact! read more

Nshan is a great guy and even took time to Facetime with me to assess the issue prior to his arrival. He was courteous and prompt. He gives a fair price for the work and is very knowledgeable and will take the time to explain the situation and options. I would recommend he be your first call and he might even be able to talk you through the fix on Facetime. Great service will use him again. read more

Its over 100 today and on short notice they came and fixed a capacitor issue with the AC unit. Sears, the installer was unable to accommodate, which is not surprising based on our past experience with them. Guarantee AC fixed the problem quickly and professionally. Pointed out a couple of other things to be mindful of regarding the original installation. Great service! read more

Man, what can I say about Nshan. On two occasions, I've had emergency hvac issues that required immediate attention on sweltering summer days. The first time I had an issue with the hvac system, I called at least a dozen companies on a Sunday afternoon, none of which cared about the urgency of the situation. Enter Guarantee and Nshan. He dropped everything and rushed over to figure out the issue. Once here, he was thorough in explaining the issue to me and offering different solutions. He was patient walking me through all the different questions I had. Cut to a year later, a different issue came up (air was blowing, but it wasn't cold) and Nshan came over (again on a Sunday afternoon) to take a look at the hvac system. It turned out to be more of a complicated issue and again, Nshan patiently explained the issue, both to me and my landlord. Nshan is very pleasant to work with, full of integrity and patience and always walks you through the different options for the work required. I have never been more pleased with a repair person than I have been with Nshan. Thank you, Nshan! read more

We had a mold issue due to a leaky attic AC unit and our insurance told us we needed to have it fixed immediately before they could start a claim. The problem was that it was 9pm on a Friday nite. I called around hoping to get a sympathetic ear and a Saturday appt. Nobody would do it. I finally got down the list to this company. Never heard of them. I called the number and Nshan answered. He squeezed me in the next morning. All the good qualities that the other posts say about him, I saw them myself. No BS. No sales talk. No high prices. This guy is from another era and I appreciate that. Very very pleased. read more

We had our roof A/C and Heating package unit upgraded by this company. They did an excellent job, would recommend their services to anyone.

The owner made himself available on a Saturday at the last minute to help us get our air conditioning unit back up and running. I appreciated his timely arrival, his fair prices, his expertise when addressing our problem, and his work ethic. We will use his services again. read more

I just wanted to write a quick review about Guarantee Heating Air Conditioning & Refrigeration. I've had these guys do work for me on two occasions, and I have to say both times I've been extremely satisfied. I do a lot research and need to trust the people that I hire to do work for me. After I used their services for my first house I contacted them to install a central heating and air for my new house. This time I wanted something more complicated that I just would not trust anyone to install, especially in my own house. Guarantee designed and installed a 3 zone 5 ton 18 ceer York AC and Heating unit in my house. Needless to say all their work passed inspections with flying colors. I have to say everything has been working flawlessly from day one. If you're looking for someone with expertise and someone you can trust to stand behind their work these are the guys for you. read more