This is the time of the year when passive heating http://hrv.co.nz
really works well. The system works by taking hot or cold air and
pumping it into the house, as temperature dictates. i.e. cold
house/warm roof equals system on and soon warm house. More on the web
page. The filtration system hrv uses filters to .5 micron - filtering
smoke and the like - no more pollutants in our house thanks!!
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