Reliable heating & cooling services for when it counts

Free Estimate
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
Learn More About Us
We represent the finest HVAC manufacturers in the industry, bringing you the best in technology, efficiency and reliability.

Learn More About Us

Don’t just take our word for it...

It only took Brian one day to do the work. He explained to me what he was doing along the way and was happy to answer my questions. He arrived on time and took care to protect my white carpet.

Cindy
Geneva

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