示例案例
AC runs all day but the house won't cool
HVAC · Cooling
你描述的情況: Thermostat set to 74°F, house stuck at 79°F by mid-afternoon. Air from the vents feels weak and only slightly cool. It's 101°F outside — peak Austin summer.
較可能是什麼
Three causes cover most cases: (1) a clogged air filter starving airflow, (2) a dirty outdoor condenser coil, or (3) low refrigerant from a slow leak. The filter is a free check you can do yourself, and a dirty coil is easy to spot from outside — but cleaning the coil is a technician job, not a hose job. The third cause is licensed work outright — refrigerant handling is regulated, and it is never a DIY fill-up.
決定
Run the two free checks first (20 minutes). If neither fixes it, call an HVAC tech — don't open the system yourself.
預覽版。不會上傳照片，服務器也不做診斷。
自己做
$0–$20 for a filter · 20 minutes of checks
- 1Check the filter first. Pull it out and hold it up to a light — if you can't see light through it, replace it. In Austin summers a filter can clog in a month.
- 2Confirm the thermostat is on Cool, fan on Auto, and set 3–4 degrees below room temperature. Replace its batteries if it has them.
- 3Outside, look at the condenser (the big fan unit) without opening anything: clear leaves and grass at least 2 feet around it so air can move. If the fins look matted with dirt, note it for the technician — a technician will clean the condenser coil; do not hose it down yourself.
- 4Feel the vent air again after an hour. Cool and stronger? You found it. Still weak or warm? Stop here and call a pro.
工具和零件
- • Replacement air filter (check the size printed on the old one)
- • Work gloves (for clearing leaves and debris)
- • Flashlight
安全線
- • Do not open the unit's panels and do not touch electrical parts — not even with the breaker off. Anything that needs the cover opened, a wire touched, or a breaker thrown is a stop point: stop and hand it to an HVAC technician.
- • Never open the refrigerant lines or the electrical panel inside the unit — capacitor shock is a real risk even with power off. That side is licensed-tech only.
找師傅
$89–$150 diagnostic visit in Austin; common minor repairs (capacitor, contactor) $200–$450 total (sample ranges)
該找誰: Licensed HVAC technician
預約前先問這些
- ▸“Is the diagnostic fee waived if you do the repair?” — many Austin shops waive it; ask before booking.
- ▸“Show me the failed part and the reading that proves it failed.” — a capacitor reading takes ten seconds to show you.
- ▸“Is this a repair or is the unit at end of life?” — if the quote jumps past $1,500 on a unit over 12 years old, get a second quote before signing.
In a Texas heat wave, book the first available slot and ask to be put on the cancellation list — same-day slots open up by mid-morning.
價格區間是本預覽用的奧斯汀示例數據（示例數字，截至 2026 年 10 月）。
僅供參考。拿不準時，找持證師傅是一個成立的決定。