Hello
Last year I have replaced the windows in all bedrooms with the dual glazed ones for noise and heat gain/loss issues.
But that introduced the problem with ventilation, with CO2 getting to 1600ppm in the child bedroom over night.
I have not measured in our master bedroom, as we sleep with the doors open to hear the kids.
Any ideas on how can this be fixed? Obviously keeping doors/windows is not very feasible, as it defeats the purpose of having dual glazing done in the first place.
Things I looked at (in no particular order):
1. Small HRV system like this one http://www.fantechhhv.co.nz/pages/product_sub.asp?page=aerofresh
2. Positive input ventilation like http://www.fantechhhv.co.nz/pages/product_sub.asp?page=pivLoft or http://www.fantechhhv.co.nz/pages/product_sub.asp?page=mivAir but it is mainly for heating in winter as don't want to be pushing the hot air inside during summer
3. Heat transfer kits like http://www.fantechhhv.co.nz/pages/product_sub.asp?page=FTPHTK1-3. Not really fresh air, but can be used to push cool air (living room has air con) during summer and warm air (air con or gas fireplace) during winter.
4. Ducted air con - most expensive option
5. HRV whole house - less expensive than ducted air con but still very pricey
All options come at cost of at least $600+ but cannot decide on what is best. If I go cheap, it will be cheap and I may need to re-do it later. Not all windows/doors are sealed, so whole house HRV maybe an overkill as I really only need it at night (and few hours during the day while the kids are asleep)
Anyone has suggestions? At the moment I am inclined to combine option 1 and 3. With an in-wall HRV in the living room near the air con and heat transfer kit from the living room to the 3 bedrooms.