HVAC FAQ — Frequently Asked Questions
Get straight answers on AC repair costs, heating service timelines, HVAC installation, and more — from the Orange County experts at Flex Mechanical Inc.
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Top 5 HVAC Questions — Quick Answers
How do I know if my AC needs refrigerant?
Your AC may need refrigerant if it blows warm air, has ice forming on the evaporator coil, or is running longer than normal. A licensed tech must diagnose and recharge refrigerant — it cannot be topped off without fixing the leak first.
Why is my AC running but not cooling the house?
This usually points to low refrigerant, a dirty condenser coil, a failing compressor, or blocked airflow from a clogged filter. Change your filter first — if that doesn't help, call a professional for a diagnostic.
What temperature should I set my thermostat in summer?
The U.S. Department of Energy recommends 78°F when home and 85°F when away. Setting it higher when you're out reduces energy use significantly without sacrificing comfort when you return.
How do I reset my air conditioner?
Turn the thermostat to 'off', switch off the AC breaker for 30 seconds, then turn the breaker back on and wait 3–5 minutes before turning on the AC. This clears fault codes. If the problem persists, call a technician.
What's the difference between AC repair and AC service?
AC repair fixes a specific broken component. AC service (or tune-up) is preventive maintenance — cleaning, inspecting, and adjusting the system to prevent future failures and maximize efficiency.