★★★★★
"Nothing but great things to say about Modern. Competitive pricing, professional, friendly crew, and they clean up their mess, which is unheard of. Prompt, efficient service. Highly recommend."
Bill Egor
New install · Verified
Furnace, AC & whole-home comfort in St. John, Indiana.
Family-owned since 1963 and serving St. John and all of Northwest Indiana. Fast service, free estimates, and three generations of doing it right.
HVAC in St. John
Your St. John heating & cooling team.
St. John is one of the fastest-growing towns in the region, full of newer homes and active construction. Modern Heating & Cooling helps these homeowners get systems that are sized right, run efficiently, and stay comfortable in every room.
We also take care of St. John's established homes with repairs, replacements, and maintenance, all from a local family team.
With so much newer and larger construction, St. John homes often benefit from zoned systems and properly balanced airflow so the upstairs is not roasting while the main floor is cold. We size and set up systems to handle these bigger floor plans the right way.
What we do
Heating & cooling services in St. John.
New Installations
Furnaces, ACs, and heat pumps sized and installed right the first time.
Learn more →Replacements
Out with the old, in with an efficient, properly sized system.
Learn more →Maintenance & Repairs
Tune-ups and fast repair calls to keep you comfortable year-round.
Learn more →Radiant Heat
Warm, even comfort from modulating hot water boilers.
Learn more →Aeroseal Duct Sealing
Stop paying to heat the attic and even out every room.
Learn more →Indoor Air Quality
HALO-LED purification for cleaner air in every cubic inch.
Learn more →On the ground in St. John
Common projects we handle here.
- Zoned systems for larger and two-story homes
- New construction system installs and balancing
- Indoor air quality and high-efficiency upgrades
No obligation
Need service in St. John?
Call us or request a free estimate. We answer our own phones and will give you a real arrival window.
Why St. John calls Modern
Service worth telling your neighbors about.
A local family, since 1963
Three generations serving Northwest Indiana. You reach us, not a call center.
Fast when it counts
When your system quits in St. John, we do our best to get out the same day.
Free, honest estimates
No-pressure quotes on installs and replacements, with financing available.
We clean up after
Tidy crews who treat your home like their own, every single visit.
Loved locally
Trusted across Northwest Indiana.
★★★★★
"When we called about a problem with our furnace in November, we got same-day service! The reps that came out were very knowledgeable, efficient & friendly."
Lisa Smith
Furnace repair · Verified
★★★★★
"Polite and experienced staff. They give you a very fair deal with professional install and craftsmanship. I've used them for decades. AAA+ company."
Anthony Fenyves
Repeat customer · Verified
St. John questions
Good to know.
Questions about heating and cooling service in St. John? Here are a few we hear often. Call (219) 322-4649 for anything else.
My new St. John home has hot and cold floors. Can you help?
Yes. Larger homes often need zoning or better balancing, and we can design a system that keeps every level comfortable.
Do you install systems in new St. John construction?
We do, with a proper load calculation so the equipment fits the home and runs efficiently for years.
Do you charge for estimates?
Estimates on installs and replacements are always free and no-pressure.
What areas do you serve besides St. John?
All of Northwest Indiana, including Schererville, Crown Point, Munster, Cedar Lake, Valparaiso, and the south Chicagoland suburbs.
Also serving nearby
