Dennis Heating and Cooling

Dennis Heating and Cooling Furnace and AC tune-ups, repairs, and replacements
Free estimates on furnace and AC replacements only. Serving DeKalb County-17+ years of experience.

NO coupons, NO specials, NO gimmicks, everyday low prices!

08/11/2026

Summer isn’t over yet! If your AC needs attention, make sure to reach out, we’re here to help!

-AC Services and repairs
-Maintenance
-Heating and Cooling
-Local and dependable service

Thank you for your continued support with our small and local business!

Contact Dennis today at 815-375-8859

07/10/2026

Your AC isn’t just for cooling your home, it’s for removing humidity as well.

Make sure to change your air filter often (we typically do it once a month at our home), keep vents unblocked and open, and schedule annual maintenance to help your system to run efficiently.

Call today for any of your HVAC needs, 815-375-8859

06/29/2026

With temps in the 90’s this week, here are a few things to keep an eye on with your AC unit that could be an issue:

•Warm air coming out of vents
•Water around your unit
•Strange noises
•Higher energy bills

Your unit will be working harder this week, but if you’ve noticed any of these differences, give us a call today to get scheduled for service 815-375-8859

Stay safe and cool!

06/17/2026

Did the high winds cause any outages for you today?

Power outages put strain onto your HVAC systems. If something seems off with your AC today, give us a call so we can make sure to have you comfortable and ready all summer long.

815-375-8859

05/11/2026

If you live in Northern Illinois, you know the current weather routine:
Heat on at night, AC on during the day, then back again the next day.

Your HVAC system is running overtime this spring. Before summer temps are here, let us make sure that it’s running efficiently.

Give us a call today to schedule service for maintenance checks to keep your family comfortable in all types of weather, 815-375-8859

04/08/2026

Big storms have been rolling through and there’s more on the way.

Here are some things to look at after a storm:

-clean off sticks/leaves around your outdoor unit
-make sure your furnace/AC kicks back on after power flickers
-check your filter if things got dusty
-listen for anything sounding “off”

Most of the time everything is fine, but it’s always good to catch a small issue early.

If something doesn’t seem right, feel free to call and get scheduled at 815-375-8859

Address

Pine Avenue
Cortland, IL
60112

Telephone

+18153758859

Website

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