HVAC Service in McHenry, IL
MMDS has been fixing and replacing furnaces, air conditioners, boilers and heat pumps across the Chicago suburbs since 2003. Our Crystal Lake location is about 7 miles away. When you call, you talk to the people who do the work, and most McHenry service calls are seen the same or next day.
Hours: Monday–Friday, 7:30am–5:00pm. Emergencies: we take calls 24/7.
What We See in McHenry Homes
McHenry has everything from older homes near the Fox River and the lakes, some of them former summer places converted to year-round, to newer subdivisions with standard forced-air systems. A few things come up often:
- Original ductwork and small returns. Many postwar homes still have the original duct layout with one or two returns. A new system can’t perform if it can’t breathe, so we check airflow first.
- Builder-grade equipment at the end of its life. Many homes here still have the original furnace and AC from when the house was built. At 20+ years, replacement usually beats repeated repairs.
- Hot upstairs, cold basement. Two-story homes often fight uneven temperatures. Sometimes the fix is balancing or zoning, not a bigger system. See our air balancing service.
HVAC Services in McHenry
- Cold-climate heat pump installation, including dual-fuel setups that use the heat pump most of the year and your furnace below about 35°F
- Furnace and boiler replacement
- Heating repair
- AC installation and replacement and AC repair
- Maintenance plans and tune-ups
- Indoor air quality, thermostats and duct cleaning
Replacement Costs in McHenry
Every house is different, but here are honest ranges: AC about $4,000–$8,000; heat pump about $6,000–$10,000 before rebates; furnace about $4,000–$10,000 depending on size, efficiency, brand and location. We install Trane, Carrier, Bosch, Midea, LG, Gree and Goodman, and all equipment comes with a 10-year factory parts warranty, with extended labor coverage included or available depending on the package. In our climate, paying extra for anything above about 17 SEER2 rarely pays back.
Rebates and Utilities in McHenry
McHenry homes get electricity from ComEd and natural gas from Nicor Gas. ComEd offers instant discounts on qualifying heat pumps, which is why heat pumps have become a realistic option here. See our heat pump page for current ComEd discount details. The federal 25C tax credit for heat pumps and furnaces ended for equipment installed after December 31, 2025, so if someone is still quoting it to you, ask questions.
Maintenance
Our one-time tune-up is $150 and includes a real cleaning of your equipment. An inspection is $79. Maintenance plans start at $15/month and cover an AC visit before cooling season and a furnace visit before heating season.
McHenry HVAC FAQ
How fast can you get to McHenry?
Our Crystal Lake location is about 7 miles away. Most service calls are same or next day, and emergencies are answered 24/7.
Are there heat pump rebates in McHenry?
Yes. ComEd offers instant discounts on qualifying heat pumps, and after the discount a heat pump often costs about the same as a straight AC replacement.
Should I replace my furnace and AC at the same time?
Not always. If your AC is old and your furnace is in good shape, a heat pump can replace the AC and take over most of your heating. We’ll look at both and tell you what makes sense.
Nearby Areas We Serve
We also work in Crystal Lake, Woodstock, Cary, Lake in the Hills, Round Lake, Algonquin. See the full service area.
Schedule Service in McHenry
Book online or contact us and we’ll get you on the schedule.