AC Repair
Cooling repairs for capacitors, coils, airflow, thermostats, drain lines, and no-cool calls.
Learn moreNorth Texas Heating & Air
Heating and Cooling Done Right.
Trusted HVAC repair, installation, and maintenance for homeowners across North Texas.
Available across Plano, Frisco, and Allen
Serving North Texas Since 2004
Licensed and Insured
No-Pressure Recommendations
Workmanship Warranty
Core services
Practical help for the systems your home depends on.
Repair, replacement, maintenance, and indoor comfort support without noisy sales pressure.
Heating Repair
Furnace and heat pump service with clear safety guidance and careful diagnostics.
Learn moreSystem Installation
Replacement planning, load considerations, comfort goals, and clean installation work.
Learn morePreventive Maintenance
Seasonal tune-ups that protect efficiency, reliability, and equipment records.
Learn moreIndoor Air Quality
Product-neutral filtration, humidity, ventilation, duct, and purification recommendations.
Learn moreCommercial HVAC
Light-commercial repair, maintenance agreements, rooftop units, and response coordination.
Learn moreCareful diagnostics
Why Cornerstone
Good Service Starts With a Straight Answer.
Cornerstone is built around long-term customer relationships. We explain the problem, the options, and the cost before work begins.
- Diagnose before recommending
- Explain your options clearly
- Protect your home while we work
- Stand behind the finished repair
Interactive symptom guide
Can It Wait?
This quick tool helps homeowners understand when common HVAC symptoms may need urgent attention. It is not a substitute for a technician's diagnosis.
Select a symptom to see suggested urgency.
Cornerstone Comfort Plan
Maintenance that feels less like a chore.
- Two seasonal tune-ups
- Priority scheduling
- Reduced diagnostic fee
- Repair discount
- Maintenance reminders
- Equipment history record
Repair Cost Guide
Ballpark ranges to help you plan — not a quote.
Customer reviews
Clear communication is the pattern.
"Cornerstone explained exactly what failed, showed us the damaged part, and had the air running again that afternoon."
"The estimate was clear. They talked through comfort and sizing instead of pushing the biggest system."
"Our technician was on time, covered his shoes, and left notes we could actually understand."
Testimonials are fictional portfolio content.
Service area
North Texas neighborhoods, handled locally.
Plano, Frisco, Allen, McKinney, Richardson, Carrollton, The Colony, Prosper, and North Dallas.
View Service AreaEnter a North Texas ZIP code.
Ready when you are
Let's Get Your Home Comfortable Again.
Appointments available Monday through Saturday. Emergency service available 24/7.