Even in the summer our basement stays relatively cool and we do not normally use AC anywhere in the house. Even in the summer, the additional hot air produced by the dryer should increase the efficiency of the HPWH. The HPWH makes more than enough cool dry air to compensate for the hot dry air produced by the dryer.
An improvement of my setup would be to link the dryer and HPWH electrically so they run at the same time. This would increase the efficiency of both units. I'd probably hack the dryer so that it would only run when the HPWH starts a heating cycle.
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