|reply to cdru |
Re: Another a/c issue.
said by cdru:that's a bit modified depending on the area you live, in las Vegas, and similar areas, you DON'T want to remove ANY humidity, so you can size it for the max heatload. also, in most areas, a 2 speed compressor, a variable speed blower, and a thermostatic expansion valve allows the AC to compensate for widely varying temperatures and humidity, so can be sized larger on max cooling setting. said by Viper677:
Why "on the hottest days of the year, a properly sized system will never reach the set point and thus not shut off/cycle or barely hit it and only cycle minimally"?
The most efficient system is the one who's cooling capacity just slightly exceeds the maximum required cooling load.
If the system is sized too small, it may be able to keep up on warm days, but not on the hottest days. If the system is sized too large, it will quickly cool some air, but won't dehumidify it. It can also result in hot and cold pockets throughout the house where air near the return and vents gets cooled quicker then what areas that are outside the natural flow of air remain hotter. Plus you're paying for larger capacity then what you ultimately need.