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The only problem is that instead of re-circulating and filtering conditioned air, a furnace fan is going to bring in external unconditioned air (and is only fil
by turtlebits 3y ago
The only problem is that instead of re-circulating and filtering conditioned air, a furnace fan is going to bring in external unconditioned air (and is only filtered once).
- willcipriano 3y agoYour furnace pulls from outside? Mine doesn't. I would've thought you'd want to heat the warmer indoor air to save energy.
- Waterluvian 3y agoI haven’t had a central air system that does this. Mine have always had return vents and it just cycles internal air. I’m actually very curious about more intelligent systems. Those that can: - bring in outside air on occasion to freshen things up - negotiate the best way to cool a home depending on outside air. It drives me mad when my AC kicks on and it’s actually colder outside.
- the_sleaze9 3y agoAs a kid I always wanted an external vent on the refrigerator that pulled in outside air when it was cold enough.
- dzhiurgis 3y ago> - bring in outside air on occasion to freshen things up All HRV's do that. "single room recuperator" from aliexpress is in every flat after renovation in Lithuania.
- nomel 3y agoI’ve never seen a furnace fan that pulls in outside air, unless it was some DIY garbage that wasn’t to code, or a huge money waster from 100 years ago.
- kshahkshah 3y agoFrom where? Bringing in outside air is what a 'fresh air' system does like an ERV or HRV
- SkyPuncher 3y agoMost older homes simple have an outdoor draft/damper for makeup air. You’ll draw in a lot of dirty outside air with that setup if you don’t block/reduce outside air intake. It will still go through a filter, but it’s going to cause the filter to dirty very quickly.
- afterburner 3y agoAn office or school's central air system might bring in some outside air, but regular house systems don't. They have intake grills inside the house.