[MichaelZuo]

> Seems like the big drawback of the positive-pressure approach would be flushing the heating/cooling out, too (as you've said in the article).

There are lots of enthalpy recovery systems on the market, some that can recover >75% of the 'waste' energy, though mostly aimed at larger customers. You need to do a cost-benefit analysis to see if it makes sense to spend the upfront cost.

[_Nat_]

Yeah, looks like you're right: [waste-heat recovery systems](https://en.wikipedia.org/wiki/Waste_heat_recovery_unit ).

Guessing that there are two main scenarios there:

1. A leaky house where positive-pressure causes flows to come out of various leaks all around.

2. A well-sealed house where positive-pressure causes flows to leave through a well-defined channel.

The first-case might be harder to recover heat/coolness from, as the (high/low)-temperature air might leak in a way that'd be harder to make use of it.

The second-case would seem to offer a stream of warmer/cooler air that could be used with a heat-exchanger or heat-pump or something.

To note it, well-sealed houses might have issues with relatively poor ventilation, making positive-pressure more desirable -- much like how the OP describes wanting to keep CO2-levels down with their positive-pressure system.