AC Repair in the Greater Madison Area
Need AC repair now? Our certified, background-checked technicians fix it right the first time. We are a one-stop shop for HVAC, plumbing, and electrical, so one call solves more. Serving the Greater Madison area, including Madison, Sun Prairie, and Fitchburg. Rated 4.9 from 5,206 reviews since 1984. Stay cool this summer with fast, accurate service. Schedule online or give us a call today.
What can you expect to pay?
How customers feel about the bill, in their words.
Post-job survey · verified customers
Why Choose Us
Certified, vetted techs
Trained and certified, background-checked technicians
Since 1984 locally owned
Serving Wisconsin homeowners since 1984
Award-winning service
Best of Sun Prairie and Best of Madison, multiple years
Transparent, tailored fixes
Fast, accurate diagnostics and options before work begins
One-stop home services
Full HVAC, plumbing, and electrical under one roof
What Our Customers Say
speed
“They were quick and efficient. Got my AC back up and running so fast.”
expertise
“The technician had my air conditioner problem pinpointed before I arrived.”
professionalism
“Very responsive and courteous. Explained the AC repair thoroughly.”
Your AC may run but not cool due to low refrigerant from a leak, a frozen evaporator coil, a malfunctioning outside fan or exterior unit, faulty wiring, or a dirty evaporator coil. We diagnose and fix these issues, including coil cleaning and refrigerant leak detection and repair. 24/7 emergency AC repair is available in Madison and Fitchburg.
- Check for ice on the evaporator coil.
- Replace a clogged air filter if needed.
Updated: 2025-12-23 00:00:00
Need help in Fitchburg, WI? Call (608) 291-6473 or book online.
Intermittent warm air usually points to low refrigerant, a frozen evaporator coil, a failing outside fan, or faulty wiring. We diagnose these issues and repair leaks, clean/replace coils, and fix electrical or air‑handler faults in Madison and nearby cities.
Quick checks:
- Set thermostat to Cool/Auto.
- Replace or clean the filter.
- Inspect outdoor unit clearance.
- Look for ice on lines/coil.
- Check breaker and thermostat batteries.
We also offer 24/7 emergency AC repair for urgent cooling losses.
Updated: 2025-12-23 00:00:00
Need help in Fitchburg, WI? Call (608) 291-6473 or book online.
AC repair cost for a typical home unit is confirmed after an on-site diagnostic, and Cardinal provides upfront pricing before any work begins. Most costs come from the specific part that failed and the labor time to install it, which we verify with testing rather than guesswork. A quick meter check often tells us if you’re paying for a simple electrical fix or a major component. Our team services the Cottage Grove area every day, so quotes are consistent and presented before work starts.
Typical price drivers we confirm during diagnosis:
- Specific failed component (capacitor, motor, control board, or compressor) and associated labor time
- Refrigerant issues (leak find/repair and recharge) and code-compliant handling
- Airflow-related work like coil cleaning or blower repairs
- Electrical faults, wiring repairs, or contactor replacement
- Standard-hours vs. after-hours service and any membership discounts on diagnostics/repairs
To get an exact price, schedule a diagnostic so we can test the system and show you options.
Updated: 2026-09-01
Need help in Cottage Grove, WI? Call (608) 291-6473 or book online.
AC compressor replacement cost for homeowners is confirmed after an on-site diagnosis by Cardinal Heating & Air Conditioning because parts, labor, and system specifics vary. The biggest cost drivers are compressor type and size, refrigerant needs, and how accessible the outdoor unit is. A technician also checks if the failure was caused by a leak, a failed capacitor, or airflow problems, since fixing those may prevent a repeat failure. If the system is older or has other major issues, full system replacement can be the smarter long-term spend; if the system is in good shape and under warranty, replacement of just the compressor is common. We routinely see these scenarios across the Madison area, and quotes reflect real system conditions. First-time customers can use $25 OFF, and Care Club members receive repair discounts.
- Your written estimate should list: diagnostic confirmation, new compressor part and labor, refrigerant recovery and recharge, and warranty terms on parts and labor.
Schedule a diagnostic to get a firm quote in writing before you decide.
Updated: 2026-06-30
Need help in Waunakee, WI? Call (608) 291-6473 or book online. "They were quick and efficient." — Rob R.
Still have questions?
Have questions or need service? Contact our team today to discuss your needs, request a quote, or schedule an appointment.
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