Exhaust-only vs. Lunos/TrueFresh in a ductless small home
I am considering my options for ventilation of a relatively well air-sealed 750 square foot 2 bed/1bath home (heated via radiant floor heat with a mini-split backup/cooling).
Budget is a major concern — if it weren’t, I’d go for the Lunos E2 system and mount one fan in each bedroom (probably the closet of each room), which are on opposite sides of the home. This would probably be the best possible solution, as it would guarantee fresh air in the bedrooms, high efficiency, and low noise. But, wow, $1100 — thats a lot of change compared to an exhaust-only system.
I hate the idea of spending all of this time/money to air seal every little crack I can find, only to stick a bath fan in there and suck air through whatever cracks remain. I understand that 20 or 40 CFM is a relatively small amount of air, but still!
I’m assuming the ROI of the Lunos system is probably painfully long….I can’t imagine the additional $1000 for this system is justifiable from a cost perspective.
One other benefit that I can see of the Lunos system is that it seems like it would help to keep the house closer to neutral pressure when the range hood (400 CFM) is operating. Yes, the air would potentially either “overspin” the fan, or “fight” the fan, but I would imagine they are built to tolerate this.
Anyone have any advice here? I even considered “pre-wiring” for the Lunos system (i.e. run a low voltage wire from future-Lunos-spotA to future-Lunos-spotB, and make sure line voltage is near each), but just putting in a Panasonic Whispergreen fan in the master bedroom walk-in closet and “giving it a try” for a year to see if it performs satisfactorily. Some drywall repair would be needed if I went to the Lunos, but in a walk-in closet, I’m not too worried about it.
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