Repair
$89 diagnostic, applied to your repair
Furnaces, ACs, heat pumps, and boilers. If it heats or cools a house, we fix it.
- Most repairs finished the same visit
- Trucks stocked for the common failures
- Two-year labor warranty on every repair
Denver metro · Same-day service
No heat? No cooling? We are on it today.
Cornerstone techs arrive in a stocked truck, quote the fix before opening a panel, and leave your home the temperature it should be. Most repairs are done in one visit.
Fastest way in: the chat in the corner. Tell us what is going on, drop your ZIP, and pick a service window. We confirm by text.
90 min
Avg. emergency response
Licensed and insured
Same-day service
Upfront pricing
Background-checked techs
What we do
Heating and cooling, handled
Every visit starts with a straight diagnosis and a written price. You approve it before a single part comes off the truck.
Maintenance & tune-ups
Seasonal plans from $16/month
Twice-a-year checkups that catch failures in October, not on the coldest night in January.
- 21-point inspection, photos included
- Filter, coil, and burner service
- Priority scheduling for plan members
New systems
Free in-home estimates
Right-sized replacements with honest math on efficiency, not the biggest unit on the price sheet.
- Load calculation on every quote
- Installation usually within three days
- Permits and haul-away included
Water heaters
Same-day replacements available
Tank and tankless, repaired or replaced, with the code upgrades your inspector wants to see.
- 40 to 75 gallon tanks and tankless
- Expansion tanks and valves to code
- Old unit hauled away, no fee
The Cornerstone standard
Fixed right the first time
We have been keeping Denver metro homes comfortable since 2004. Our techs are employees, not subcontractors, and every job gets checked against the same standard: would we sign off on this in our own house?
12,400+
Homes served across the metro
4.9
Average review score
2004
Family-owned since
100%
Written quotes before work starts
Service area
Where we work
Based in Arvada, dispatching across the Denver metro. Inside this list, same-day is the norm, not the exception.
DenverArvadaWheat Ridge
GoldenLakewoodWestminster
BroomfieldThorntonNorthglenn
AuroraCentennialLittleton
EnglewoodHighlands RanchParker
On the edge of the map? Ask in the chat and we will confirm your address in a minute.
Reviews
What the neighbors say
★★★★★
Furnace quit on the coldest night in January. A tech was here by nine the next morning and we had heat back before lunch.
Dana · Lakewood
★★★★★
They quoted the price before opening a single panel. I paid exactly what was on the paper.
Marcus · Thornton
★★★★★
Two other companies told me to replace the AC. Cornerstone tuned it up instead, and it has run fine for two summers since.
Irene · Centennial
Financing
A new system should not wait on a lump sum
Zero percent financing for 18 months on approved credit, or fixed monthly plans up to 60 months. Decisions usually come back in minutes, and your installer handles the paperwork on site.
0% for 18 months · Plans to 60 monthsSubject to credit approval. Ask your tech for current terms when you book.