I have read many great posts about HRV (Type) ventilation systems.. and i understand that bringing in warm air from the ceiling space to any significant degree has been debunked by consumer groups etc.. But i have a question around a way to use that heat that we know is actually up there in the ceiling space..
I would like opinions on how people think this idea would work..
Using the same principles as a heat exchanger.. e.g. with cool incoming air.. passing over warmer outgoing air.. how do you ventilation experts think this idea would work..
I live in a 70 year old bungalow on the Westcoast and we can at times even in the winter have long periods of sunshine.. even though the outside temperature is still quite low.. But having done lots of work over the winter months up in my ceiling space.. I know for a fact that it still gets really hot up there.. and I have also noticed that coming into the house at times during the day.. I can feel warm air coming in from the open access door to the ceiling..
So my idea is this: How about instead of putting in a (positive pressure) ventilation system that draws air from the roof space.. because - even with effective filters - it is blooding horrible up there.. pink batts, rat droppings etc.. I was thinking to bring in fresh air from under the eaves then run uninsulated ducting along the length of the roof at the highest point of the roof apex.. eg. just under the ridge line.. (possibly even running two or three lengths of ducting) if this area is still really hot, would this have the effect of warming the incoming air??
In much the same way as those DIY heat panels you can place on an outside north facing wall work??
Then duct that air into several rooms.. I realise that this air will only be hot during certain periods of the day.. But thats fine.. as to be honest it never gets that hot down here that one would not want a little extra warm air coming into the house..
In principle do you think that would work.. ??
FYI.. A bit of extra info.. Since moving into the house - just this year - we have put polythene liner on the dirt under house.. Fitted Expol polystyrene insulation under the wooden floors, and added R3.6 Pink Batts in the ceiling.. and to be honest it is pretty easy to heat.. even though we (temporarily) are only using oil filled heaters for heating.. We will be installing a Woodsman burner before next winter..
I have also started to double glaze the old wooden windows.. using acrylic.. I will post later an instructable on this.. but when I looked into the crazy prices I saw people on here paying and quotes I got, I was shocked.. I have so far only done the south side bedrooms.. but have noticed a huge difference in those rooms.. particularly with retaining heat in the evening.. often without any heating on.. It has cost me about $200 so far.. and based on the windows left to do.. I think will still be less than a $1,000 for the entire house.. and a using a VERY simple method.
Your thoughts on my ventilation idea will be most appreciated..