It’s 40°C at dusk during a summer heat wave. My electric utility is threatening blackouts and begging people to conserve.
I have a couple unused rooms in a detached suburban house that don’t need air conditioning. If I close the air vents and the doors to these rooms, will my air conditioning usage (and my electric bill) decrease, increase, or stay about the same?
My first thought was that less conditioned air volume absolutely means less cooling. Then I started thinking about the lack of insulation in the interior walls and about air leakage in ducts that now carry greater static pressures. Is there any guidance that doesn’t require a full building energy audit?