Reviews of local pros in Cincinnati, Ohio

I had an issue with a furnace in a house that I own. I called and spoke with Zach; he got me scheduled for the next day in the AM.
Jim, the service technician was very knowledgeable, he was able to diagnose and fix the problem, within minutes, the system was up and working. You can't find a more honest, friendly heating and air company, they believe in treating their customers like family.

I rarely write reviews, but C&H has done such a good job for us, I wanted to call them out. They're great at what they do and honest.They don't try to sell you anything you don't need. Just good customer care. Easy 5 stars. We switched to them this spring at the perfect time. In June, our 23 yr old AC died and they installed a new one promptly and with 0% financing. They followed up 3 times to make adjustments until we were happy with the thermostat. This fall our 20 yr old boiler had big issues that the previous HVAC company missed. Dave was observant enough to catch what might have been a big problem and was SUPER thorough in making sure the repair was done well. A fair price, too. It's rare to find such high-quality HVAC work and customer service like this today.

Service tech was on time and work was completed in a professional manner. I would highly recommend Corcoran & Harnist for your heating and air conditioner needs . Dan M is a very knowledgeable technician. Thanks again.

I needed a repair on my air conditioner on a Sunday. Jordan Clenney was the Service Technician. He arrived quickly, and was very friendly and knowledgeable showing me what needed to be fixed and making recommendations. My family has used Corcoran and Harnist for years. Everyone is always so nice, and they know what they’re doing! Thank you, Jordan!

I came home from vacation to -1 degree temperatures and my 20+ year old furnace died! Replacement parts for such an old furnace would take several days and honestly wouldn’t have been worth the cost. Corcoran and Harnist owner Taylor Harnist was AWESOME. Shared options with me, answered my questions, never tried to up or over sell me, and had my new furnace in the very next day. Excellent experience!

Corcoran & Harnist helped me install completely new systems on remodels and they service my personal home.
Recently, Mitch, Stewart, and Brian tackled a very tough boiler pipe repair job that other companies passed on due to its complexity. They accepted the challenge and did not quit, coming up with solutions until it was fixed. Price is fair and they are honest group. Will continue to partner with them.

Dan Mangold performed a service call at our house today and did an excellent job. He explained exactly why we needed a new part and the benefits of leaving the fan running all the time. We would be extremely happy if he would be the one to service our house every time we have a service call. He is definitely an asset to your company.

Service Tech Dan Mangold serviced our unit today as we are getting ready for summer. We have been customer’s of Corcoran & Harnist for many many years & Dan provided exceptional service. We are having the interior of our house painted & Dan carefully worked around the ladders & painting supplies without a complaint or issues. Once again, another A+ service from Corcoran & Harnist and Dan Mangold.

Dan Mangold with Corcoran & Harnist comes out bi-annually to check & service the ac/heat pump unit in our home. Truthfully, we couldn’t be happier. Dan is very friendly and respectful of property. He is thorough and honest with his inspection, and when necessary, takes the time to explain any issues. Thank you very much, Dan! We appreciate the work that you do.

Inherited them with the house well kinda I called because they installed the stuff originally and they were so easy to talk to and helpful that I have now continued to use them. Had them out to help me with thermostat issues and just now Scott did my seasonal service an was great he answered my questions cleaned up stuff and my dog even thought he was great. I look forward to continuing to work with this company

Corcoran & Harnist has been taking care of our heating and air conditioning for decades. They are friendly, responsive, and go over and above to meet the needs of their customers. I can’t say enough about how much I appreciate Dan. He is the service technician who has been taking care of my home for years. He is kind and knowledgeable and always takes care of my home as if it were his own. I truly am grateful to have a company I trust for our heating and a/c service needs.

We are genuinely impressed with this company. They serve both commercial and residential clients, and we found ourselves in urgent need of help with our Lochinvar Boiler System. Thanks to the skills of Dave and Matt, they not only restored our hot water and heating but also added a component that had been missing since the installation back in 2018. We also decided to join their maintenance program, which will ensure that our boiler and air-conditioning system are well taken care of, especially after realizing that a previous company had not serviced them properly. It’s such a relief to have a knowledgeable team supporting us.

If you have the chance to have Dave come to your home or business, you’re in for a treat. With over 30 years of experience, he brings a touch of old-school hospitality that makes working with him a fantastic experience.

Consistently great service. Most recently, Dave W was here for our spring maintenance. When he walked in the house, and without even taking a measurement, he speculated that our airflow was low (based on his ear and his experience). When he looked into it further he confirmed it was low and adjusted it. We now have more consistent temperatures throughout the house. He also performed the most thorough inspection and cleaning we have had over our many years of being homeowners. I highly recommend.

Absolutely amazing company! Called them to check out our old boiler at our church (First Baptist of Cleves) and they have been nothing but amazing! Keeping us informed and quick with the repairs! I would recommend them to anyone! Very professional and knows what they are doing.

We had a whole new heat pump and air handler installed by Corcoran & Harnist. I’m glad we went with them as they were friendly and professional the entire time. Compared to two other quotes from other companies, they were better priced for a more efficient unit. Would highly recommend them for all your HVAC needs.

On December 12, 2025, I had my annual service maintenance to have my furnace looked at. There was a charge for the service of $159.65. About 2 to 3 hours later, I noticed water on the floor. The water is slowly dripping from the side pipe connected to the furnace unit. I called Corcoran & Harnist back and they sent out a second person. The second person did whatever it is that they do but at the end explained that water is dripping inside the furnace and it’s a small puddle that will drip from the pipe once it gets high enough to drip out where it's connected to the unit instead of the pipe that’s draining into the floor. He said it won’t cause any damage to the furnace itself as long as my heat is on everything should be fine. I'm concerned because there was no water when the initial service person came out and I paid for the services he never mentioned the water issue. Can y’all tell me if this is an issue or not?

Please let me express. This is not a complaint. I’m pleased with the service from this company with past experiences. I have been using them off and on for a few years. I’m wondering if water dripping from the unit is a concern? This is not a complaint. Corcoran and Harnist has a great team, and I will continue to work with them in the future.

Hader Heating is great and so is Paul who has been servicing my A/C for many years.

Today our furnace motor went out. The tech was prompt, polite, and the repair bill was very reasonable. My Dad's been using them for years. I guess that's why. ***EDIT*** Im changing this review to 3 stars because they Refused to Mail a bill to us, instead demanding payment now. It's understandable I guess. But U can be pinched for money on a 25 Degree day, when we've been paying super high heating costs through the cold winter. Plus my Dad's been a good customer, never any payment Issues from our side. Brian was our tech.

Paul from Hader's provided excellent service on my oil furnace when it developed an oil leak. I appreciate their quick service.

I had another roofing co do some repairs on my roof near the chimney. The roof still leaked after they made the necessary repairs. I called Hader and they came out and gave me a repair estimate. They also explained what needed to be done. The Hader Team did a professional job. The roof doesn’t leak anymore and they did a professional clean up. Great Job.

Doug Beiser was awesome. His service, expertise and knowledge were incremental in getting our system running a 100%. He spent the better part of his evening with us. We can't thank him enough. Doug is the real deal and will be the only person we contact to take care of our HVAC in the future.