Bigger Is Not Better
This is the most expensive misunderstanding in the trade, and it is also the easiest to check yourself with a $15 hygrometer.
What actually happens
An air conditioner does two jobs: it lowers temperature and it removes moisture. The second one only happens while the compressor is running and air is passing over a cold coil, condensing water out of it.
A unit that is too large for the house reaches the thermostat setting quickly and shuts off - sometimes after eight or ten minutes. It satisfies the temperature in short bursts and never runs long enough to pull much water out of the air. The result is a house that feels cold and clammy, with indoor relative humidity well above 60%, and in humid regions mold appearing on closet walls and behind furniture on exterior walls.
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What to buy instead of tonnage
| Option | Typical US cost | When it is the right answer |
|---|---|---|
| Fan-off delay and duct balancing | $150-600 | Mild cases - worth trying first |
| Standalone dehumidifier, well placed | $250-900 | One problem room |
| Whole-house dehumidifier on the ductwork | $1,600-4,500 | Genuinely oversized system you are not replacing yet |
| Correctly sized variable-speed replacement | $9,200-11,800 | When the unit is due anyway |
Notice that the cheapest options come first for a reason. If a contractor's answer to a humidity complaint is a larger unit, that is the one answer that reliably makes it worse.
Common questions
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