Fast, reliable HVAC system service

Adrian was professional and courteous and knowledgeable and performed CO2 analysis and checked all system error codes, reviewed readings with me and discussed options for furnace replacement. Contacted sales and we ask worked together to arrive at the best decision. Installation team was available same day to complete removing the old and installing the new with necessary ductwork, hoses, smart thermostat. I’m very pleased I called Harker!

The customer service was wonderful.Had our heat fixed and back up and running so much faster than I thought possible! Well done.

Diagnosed and replaced water heater in a single afternoon. Fabulous!

Harker is the BEST! Furnace went out--my company I'd been a good customer with for over two decades told me I'd have to wait 5 days to get it fixed--when the temp was going to be in single digits for more than half that time and down to -12 the fourth night. They made no effort to see if they could find parts sooner. Next company couldn't guarantee sooner but was helpful and referred me to Harker. Harker FOUND the parts within a couple of hours and fixed it the NEXT DAY!! It was an all-day job. I will never go anywhere else. Go to them first--don't bother with anyone else if you're in or near Madison, Wi. And the technician was super professional and very skilled.

Our furnace problem popped up on a weekend, so we used Harker's online system and easily scheduled a Monday morning service call. It worked perfectly - we got a text with Roger Swenson's photo when he was about 45 minutes out, and Roger arrived on time. He was exceptional, and a great representative for a great company. He clearly explained every step; explained our options; and got us all up and running quickly. As always in our work with Harker Heating, the service was great, and Roger was highly skilled, and easy to work with.

The work completed by Lee and the customer service provided by Nate is match by none. They are a pleasure to work with. I have been a Harker customer for 22years, and their excellence to detail and customer satisfaction is phenomenal

Please have this technician referenced as preferred for all future visits. Exceptional knowledge and professionalism.

I had an issue with my central heating system. The assigned tech, Adrian, was very professional and pleasant. He quickly diagnosed the problem and had it fixed.

Very pleased, technicians were knowledgeable and professional, arrived exactly on time and explained everything clearly.