Correct all-year-round ventilation for basement (bedroom, kitchenette, bath, laundry) in cold climates (Zone 5)
- I live in Worcester County in Massachusetts (Zone 5)
- The basement comprises of a finshed section that is an open area which serves as a bedroom for my mother-in-law, and an unfinished section that is the laundry room and storage (Total basement size is 930 sqft). See attached document for floor plan and ventilation plan.
- We are adding a bathroom and kitchenette by taking a bit of each section
- I am planning to install an HRV system, dedicated to the basement alone. Initially, the plan was that the HRV will suply air to the open space and pull from bathroom and laundry without a dedicated/local bath fan or bath exaust. Humidistat in bath.
- I've heard if not built for the HRV, a bath fan fed into a HRV can ruin the HRV core. Since I do not plan using a bath fan, I'm guessing this does not apply to me
- I've also heard that recent Energy star homes requires a local exaust-only bath ventilation despite an HRV. Not that Energy start is my goal, but it has me thinking.
- What I've also heard is that an HRV should not be used in the summer (e.g. add to humidity issue)
- Also read fatty air from cooking can damage the HRV core
- Based on the above, it seems that using just an HRV might actually be ok in the winter. Stale cooking air can be filtered with a hood. BTW, there will not usually be major cooking in the kitchenette. Using the HRV in the summer as bath exaust, besides the isue mentioned earlier, might be an overkill and not energy efficient as a whole.
- Initially, was opposed to a bath exaust fan that bypassed an HRV, as I considered this a waste of energy. But to ensure good dehumidification in the summer, and to ensure the bath can be ventilated sufficiently and at anytime, summer or winter, and without causing troubles on the HRV, it seems I am for a local exaust-only bath fan. And perhaps it can be tied in to the kitchenette hood??
- The attached screenshot shows the floor plan and how I plan ducting the HRV. The red squares are registers/dampers.
- What is the right way to ventilate this basement in an energy efficient, sustainable way?
- What should be done, what should run, and how in the winter and in the summer?
- It's been said an HRV system is the right thing for this climate zone, but is it for this basement, or is an ERV a better choice?
- What's the best way to ventilate the bath and kitchenete with the presence of a balanced system (e.g. HRV)?
- Are twin systems HRV/ERV combination products the solution?
Architecture/HVAC: Post and beam construction; Electric baseboard and woodstove (No HVAC system)
Line, blue: supply duct, HRV
Line, red: exaust duct, HRV
Arrow, Blue: Fresh air suply/flow
Arrow, Orange: Stale air flow
Rectangle, red: Register/dampler for exausting stale air
Rectangle, purple: HRV
Line, green: new wall/door
HRV: heating recovery ventilator
ERV: energy recovery ventilator
Posted Mon, 03/03/2014 - 01:35
Edited Mon, 03/03/2014 - 09:44
Other Questions in Green building techniques