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The most common causes: Failed capacitor — starts the compressor; when it fails, the fan runs but the compressor doesn't, so no cold air. Most common repair ($150–$300). Low refrigerant — a leak causes gradual cooling loss. Refrigerant doesn't run out — low levels always mean a leak. Dirty condenser coils — when outdoor unit coils are coated in dirt, efficiency drops 30%+. Frozen evaporator coils — caused by restricted airflow or low refrigerant. Call (844) 511-3573 — a local tech diagnoses the exact issue same day.

In most areas, HVAC Service Line connects you with a local technician who can arrive same-day — often within 1–3 hours for emergency situations. Response time depends on your specific ZIP code and current demand. During extreme weather events (heat waves, cold snaps), same-day slots fill quickly — calling early in the day gives you the best chance at a same-day appointment. After-hours and weekend service is available in most areas, though response times may be slightly longer.

The industry standard is the 5,000 Rule: multiply your system's age by the repair cost. If that number exceeds $5,000, replacement is typically more economical. Additional signals to replace rather than repair: your system is over 12–15 years old; it uses R-22 refrigerant (discontinued — now very expensive to recharge); the repair cost exceeds 50% of a new system's installed cost; or it has needed repairs more than once in the past two years. A local technician will give you an honest assessment during the free on-site estimate.

Start with the basics: dirty air filter (replace it — a clogged filter causes the furnace to overheat and shut down); thermostat set to HEAT above current room temp; circuit breaker (reset if tripped). If those don't fix it, common causes include: Failed igniter or pilot light (most common furnace repair). Dirty flame sensor — furnace lights then immediately shuts off. Cracked heat exchanger — a serious carbon monoxide risk. If you smell gas or suspect a CO leak, leave the home immediately and call 911 before calling an HVAC technician.

Filter change frequency by type: Standard 1-inch filters — every 30–60 days. Thick media filters (4–5 inch) — every 6–12 months. Homes with pets — more frequently. A clogged filter is the single most common cause of HVAC problems — it restricts airflow, forces the system to work harder, causes overheating or freezing, and can void your warranty. Check monthly and replace when visibly gray. A clean $10 filter prevents a $300+ service call.

HVAC Service Line is a referral service that connects homeowners with independent local HVAC technicians and contractors. We don't perform HVAC work ourselves — all work is done by local contractors in our network. There is no cost to use our service — you pay the local HVAC contractor directly for the work they perform. We are not affiliated with any national HVAC franchise or brand.