4 ms·

Side note: if you can, check your thermostat and see if you can set your thermostat’s “fan mode” to on, instead of auto, for all the schedule settings that appl

by tikkun 3y ago

Side note: if you can, check your thermostat and see if you can set your thermostat’s “fan mode” to on, instead of auto, for all the schedule settings that apply while you’re in the house. Ecobee allows this (comfort settings -> select presets that apply while you’re in the house -> change heat mode fan and cool mode fan to on). It’s the most effective way I’ve found for lowering CO2 for rooms that don’t have windows or when opening a window is impractical.

LUmBULtERA 3y ago
In my area it is very humid the the summer months. If I leave the fan to “on” without the AC on it ends up also increasing indoor humidity quite a bit. We have a single stage AC unit… ideally a variable speed unit could just run longer at a lower speed, allowing more ventilation and humidity reduction.
quercusa 3y ago
If you have the option, a "circ" or timed mode (e.g., 10 minutes/hour) is better than "on" when using air conditioning, as the fan will blow condensed water back off the coil, raising the humidity you just paid to reduce.
- schiffern 3y ago
  On the other hand, if you don't evaporate water off the coil then it stays wet all the time and grows mold quickly. This is very bad for indoor air quality. For this reason I intentionally run the fan after a dehumidification cycle. Yes a small amount of humidity goes back in the air, but it's a small price to pay for non-toxic air! You should probably have your AC unit professionally cleaned and inspected.
  - quercusa 3y ago
    The water doesn't need to evaporate off the coil; the coils are designed for it to drip off to the drain pan and out to a hose or condensate pump.
    - schiffern 3y ago
      Some water drips off, yes. Some water remains clinging to the coil and contributes to mold growth, especially if it's allowed to remain for long periods of time. After all, if there were no residual clinging water then the fan couldn't "blow condensed water back off the coil", which was your original concern. ;-)

by tikkun 3y ago

LUmBULtERA 3y ago

In my area it is very humid the the summer months. If I leave the fan to “on” without the AC on it ends up also increasing indoor humidity quite a bit. We have a single stage AC unit… ideally a variable speed unit could just run longer at a lower speed, allowing more ventilation and humidity reduction.

quercusa 3y ago

If you have the option, a "circ" or timed mode (e.g., 10 minutes/hour) is better than "on" when using air conditioning, as the fan will blow condensed water back off the coil, raising the humidity you just paid to reduce.

schiffern 3y ago
On the other hand, if you don't evaporate water off the coil then it stays wet all the time and grows mold quickly. This is very bad for indoor air quality. For this reason I intentionally run the fan after a dehumidification cycle. Yes a small amount of humidity goes back in the air, but it's a small price to pay for non-toxic air! You should probably have your AC unit professionally cleaned and inspected.
- quercusa 3y ago
  The water doesn't need to evaporate off the coil; the coils are designed for it to drip off to the drain pan and out to a hose or condensate pump.
  - schiffern 3y ago
    Some water drips off, yes. Some water remains clinging to the coil and contributes to mold growth, especially if it's allowed to remain for long periods of time. After all, if there were no residual clinging water then the fan couldn't "blow condensed water back off the coil", which was your original concern. ;-)