qwerty said:
nosuchreality said:
daedalus said:
Why yes, yes they do!
I've been having a sore throat for a few days and I'm wondering if it's due to the smoke. But I've been staying indoors. It really feels like I'm coming down with a cold, but this time a year it's very atypical, plus I work from home, so any outside exposure is minimal. AND, because I'm visiting my elderly/frail parents later in the week, I'm getting a COVID test today to make sure I can get on a plane and see them.
Yes, that's the 'smoke'. Actually the PM2.5. Even the 1900 filtrete only moderately removes it. Your AC also pulls outside air as a percentage of air flow. Not to mention the side effects of three weeks of heat wave, bad air,.closed up heavy AC use.
I don?t think AC units bring in outside air.
The AC unit does not cool by using outside air, but as homes became more energy efficient and effectively more sealed, modern HVAC design includes freshening by bringing in small amounts of outside air to replace the some of the stale polluted inside air.
if your system is lower efficiency or house less sealed, you may not have or need it because your house is breathing plenty of outside air through the attic and seals anyway.
Or even more simply, every cubic foot of air you suck out through the bathroom vent of range hood has to be replaced, it gets sucked in through all the little gaps.