(815) 744-40042300 Mc Donough, Joliet, IL 60436
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Lockwood Furnace CompanyThe Best HVAC Specialist for Coal City and Diamond, Illinois

We are no strangers to the many HVAC needs of Coal City and Diamond, Illinois. Lockwood Furnace Company has grown up with the heating and cooling industry, but we have never forgotten where we came from. We are a family business. We feel a part of Coal City and Diamond.

Our company has serviced, repaired and installed central heating and air conditioners, furnaces, boilers, whole house humidifiers, mini-duct systems and air cleaning products throughout Coal City and Diamond. In fact, we would say that there isn’t a home, business or industrial HVAC challenge in Coal City and Diamond that our professional technicians haven’t seen. We have the proven ability (more than 80 years worth!) to service, repair or even retrofit virtually any HVAC system made.

Lockwood Furnace has 24/7 emergency service throughout Coal City and Diamond for any heating or cooling problem. Of course, we also offer regularly scheduled maintenance and servicing programs to keep any HVAC system in the best shape.

Proud of Our Technicians, Proud to Serve Coal City and Diamond!

We are certified as a Trane Comfort Specialist. We specialize in replacing the complete line of Trane and Lennox HVAC products in Coal City and Diamond. We have been in business since the 1930s and we know heating and cooling from the inside-out and that is why we recommend Trane and Lennox. We know – and so do you – that furnaces, boilers and air conditioners depend on experts to install them. Our HVAC technicians are the best in the business! Our customers rate us very high in customer satisfaction and much of it is due to our great people. We are proud of them.