If I could give 10 stars, I would. Wow. Could not be more satisfied with Pat's work. He is so…read morequick and responsive and you can tell how much he actually cares about his customers. He recently installed a full overhaul for us, after help us make our very old system last way longer than it should have for the past 1.5 years. The new system (2 AC units + 2 heating units) were installed in under a week. We did the install during the hottest week of the summer and he made sure that we didn't have AC outage on either floor for more than a day and we were up and running before we left. We have lived in our house now for 4 years and our house has NEVER held the temp that we set it to (if we had it set to 70 we would be lucky if it would get to 72). It is holding now and nice and COLD. I found Pat via good reviews on google two winters ago when our heater broke in the middle of the winter and the company who I was contracted with told me they would be out in 2 weeks...meanwhile I had a baby at the time and could not be without heat for 2 weeks. He was there the same day and fixed the unit for me that the other company said I needed totally replaced. As mentioned above, he has been helping us tie the old machine over for a while and never pressured us to upgrade, just provided us with all of our options. Overall a great business owner and a great guy. You will not be dissapointed!

I would give six stars if I could. Pat was very thorough and professional. There are a few HVAC…read morecompanies in the area that could have and probably would have ripped me off. He took the time to explain what he saw and was fairly priced. He would be the kind of contractor I would feel very comfortable letting in my house when I'm not home. I highly recommend this company for any HVAC needs. Thank you Pat.

I had a hard time finding anyone who would come out to look at my furnace. I had called multiple…read morecompanies (including some big names) over the past few days and none would come out right away. Tonight my furnace stopped heating and of course it's the coldest night of the season. I called Clark's from yelp and he was here in 25 minutes! He diagnosed the problem quickly, had what he needed in his truck to fix it and now I can go to sleep with a warm house and not worry about the pipes freezing. The repair was on the expensive side, but it was actually less than what I was quoted before which surprised me for an emergency call. Would highly recommend if you have a furnace that needs help!

the service they provided was very quick& prompt!! the guys were very polite and respectful of our…read morehome!! we needed our old gas heating system in our basement removed and replaced!! they completed it in two days along with the wiring of the whole new system,i would definitely definitely recommend them to anyone that needs service for their plumbing or electric! their great guys

They are very responsive to the customer needs,…read more I had a NO HEAT issue recently. Westly was my Service Rep, he analyzed my unit and accurately determined my problem. Even with having to go and get the necessary part I was up and running in no time. I highly recommend ZCS for your heating & cooling issues!! They treat you like family !!!!

Rick and his workers have did many jobs at my house. I've…read morebeen using them over 10 years. He just installed this spring a new furnace and blower for me. They are fantastic crew of guys and his secretary is the nicest girl to talk to. You will not go wrong with the company. They take time with you An are very reasonable they work with you it's an amazing company I can go on an on. Anyone having a problem with This company should step back something's wrong there.

Scott and Jordan completed a new furnace and AC unit install for me last week. These two are the…read moreutmost professionals, taking pride in their work along with answering questions I had about the new system, as well as providing information about potential rebates that could be applied for due to the new install of energy efficient equipment. I was in good hands with Cornerstone HVAC and they stand by their work. Scott and his son Jordan, are a good team, and a prime example of a family owned business. I highly recommend Cornerstone HVAC when considering your heating and cooling needs.

Friendly and professional. Very responsive and fair priced! Takes the time to explain the problem…read moreand never tries to oversell.

Our regular HVAC guy was laid up. Contacted Volkman to diagnose a heat problem on our 2nd floor…read more Volkman kept his appointment & diagnosed our problem as a nonfunctioning duct dampener. The cost for the diagnosis was $224.19. The estimate to return & change out the malfunctioning dampener was $836.05. This would have been a total charge of $1,060.24 to replace a faulty $200.00 dampener. Our regular HVAC tech recovered, stopped & replaced the dampener for a total of $385.00. This included re-diagnosing the problem, parts & labor. Problem solved. I would never use Carl Volkman & sons HVAC LLC again. Their prices are exorbitant & unfair.

Heat pump stopped working. Called Carl and he scheduled me the next day! I was a new client and he…read morewas kind and explained what happened to make my unit shut off.

New heat pumps from Lanark last fall. The install was genuinely excellent. Two techs, full day,…read moretested everything and set the thermostat schedule up with me before they left. The follow up is where they lost me a bit. I called in July during that hundred degree stretch about a noise and it took two days and three phone calls before anybody called back. Turned out to be a loose panel, five minute fix, and the tech who eventually came was apologetic about it. I understand July is their nightmare month. Still, two days. If you're buying from them I'd ask what their summer response actually looks like before you sign anything.

Replaced our ancient furnace that finally gave out. The tech came out, gave us a few options at…read moredifferent price points, and didn't pressure us toward the most expensive one. Install took most of a day with two guys working. They were clean and laid down floor protection the whole time. New unit is so much quieter and our first gas bill was noticeably lower. The only hiccup was they had to come back to adjust the thermostat wiring but fixed it no charge. Solid company.

Our landlord scheduled them to replace filters for heating/air-conditioning unit which is needed…read moreevery year.... I asked the man who (said he's been here before) came to use Boot Covers - he said they don't use them.... In getting up into the attic, he broke the drywall. I asked him if he had a stepstool or a ladder and he said he only had a 4ft ladder... He got a 5gallon bucket and turned it upside down to use... I have insulation down all the steps and the on the carpeting to out the door... He also had to borrow my dustpan & brush to cleanup his mess!!!!! Now what business doesn't supply Boot Covers, Small Ladders/Steps tools or Dustpans , Brushes for HVAC work???? You're going in & out of houses and respect should be given to people's property!!!

I had used them for about a year in 1980 and had good service, so when I bought a house with oil…read moreheat in 2019 I became a customer once again. I had them out to work on my furnace every year and had two emergencies that first season. The technician was knowledgeable, clean, and courteous. The two urgent calls were dispatched much quicker than I expected. Because of that I purchase all my oil from them and their rates are competitive. I highly recommend them. Bill Beck, Ephrata, Pa.