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Opening windows can bring in pollen, dust, humidity, noise, and a lot of energy loss during cold winters and hot summers.

In a bedroom it might be worse than the elevated CO2 problem.

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That’s a bit of a dramatic way to describe opening a window.

I've been designing my own ERV system for the house and have been weighing all the options, so I had this list in my head. Nothing dramatic, just the reality. We have allergies and like sleeping in a cooler bedroom.

As dramatic as having a runny nose and sneezing all day, having to overuse your asthma inhaler.

Is that really dramatic, or just the reality that needs to be considered in a cost-benefit analysis? Are you a hay fever truther?

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