Reliable heating & cooling services for when it counts

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Covering the fox valley & surrounding area
Why McNally’s?
  • Honest, upfront, competitive pricing
  • 10-year limited labor warranty on installs, 2-year limited warranty on repairs
  • All work thoroughly tested
  • Professional, punctual and courteous service techs
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We represent the finest HVAC manufacturers in the industry, bringing you the best in technology, efficiency and reliability.

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Don’t just take our word for it...

We were having problems with our furnace turning off intermittently, so we contacted Service Experts for a diagnosis. After a 10 minute evaluation, the technician indicated that we needed a new circuit board, roll out limit and blower capacitor that would cost about . They recommended just buying a new furnance (about K). We decided to get a 2nd opinion, so we called McNally's. The owner was on another major job (complete AC/furnace install), but came during lunch to check out our problem. He did not see any of the same issues that Service Experts diagnosed. He recommended that we try the simplest, cheapest alternative first, which ws to replace the thermostat. He installed one in 5 minutes and our furnace has run fine ever since. It is always nice to find a local service that doesn't give you the sales pitch, but rather looks for the most practical, economical solution. Very professional, knowledgeable and polite.

Pete K.
St Charles, IL

When I purchased a new office for my business in St Charles I bid out my heating and a/c installation. McNally's was extremely competitive and provided superior value to any of the other companies I'd spoken with. The business owner was very responsive (and I did call at some odd hours initially) and I just thoroughly enjoyed having them do the install. Since then I've referred them to several people including my family and they have done other installs for an extremely competitive price and with great service. I'm very happy with them overall and highly recommend.

Justin E.
Geneva, IL