Inverter (Variable-Speed) Compressor
A compressor that varies its speed continuously instead of switching between off and full blast — sprinting to temperature, then gliding at a whisper to hold it. It's why modern ductless heads run in the low-20s dB range and why room temperatures stay steady instead of sawtoothing.
The longer answer
Fixed-speed equipment is a light switch; an inverter is a dimmer. Matching output to the actual load means fewer starts (the hardest moment of a compressor's life), better dehumidification in summer, and efficiency ratings fixed-speed hardware can't reach — the top HSPF2 and SEER2 numbers on the market are all inverter-driven.
The design caveat: inverter equipment must be sized so it can modulate down into its efficient range. An oversized inverter unit behaves like on/off equipment — one more reason honest bids start from a load calculation.
The Seattle angle
Seattle's hundreds of mild heating days are exactly where inverter equipment shines — long, gentle, efficient cycles instead of constant hard starts.
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