Licensed HVAC · Denver, CO
From a furnace that quit on the coldest night to a brand-new high-efficiency AC, Northstar's licensed techs show up fast, fix it right, and leave the place spotless.
What We Do
Heating, cooling, air quality, and maintenance — handled by NATE-certified techs who diagnose honestly and quote upfront before any work begins.
AC repair, recharge, and high-efficiency installs that keep you cool through the hottest stretch — without runaway energy bills.
Furnace, heat-pump, and boiler repair and replacement — fast diagnostics and safe, reliable heat when the temperature drops.
Seasonal tune-ups and maintenance plans that catch small problems early, extend equipment life, and protect your warranty.
Filtration, humidifiers, and duct cleaning that clear out dust, allergens, and dry air so every room breathes easier.
Why Northstar
We're a family-owned shop, not a faceless chain. Every tech is licensed, background-checked, and NATE-certified — and we quote a flat price before we start, so the number on the estimate is the number you pay.
18+
Years in business
24/7
Emergency service
4.9★
Average review rating
Real Customers
“Our AC died in a July heat wave. Northstar had a tech out the same afternoon and us cooling again before dinner.”
AC Repair · Aurora
“They replaced our 20-year-old furnace, walked us through the rebates, and the install crew left the basement cleaner than they found it.”
Furnace Install · Lakewood
“The maintenance plan caught a cracked part before it failed. No surprise breakdown, no emergency fee. That's peace of mind.”
Maintenance Plan · Denver