At my old house, we replaced the HVAC with a high efficiency unit that came with a thermostat that would blow, say, 50% to 70% of the time for air movement to increase comfort level. I'm not sure but I think I recall that it was a variable speed fan that did that for a milder air flow.
My son just bought his first house and installed a programmable thermostat that allows him to do the same thing so I suggested he let the main blower run 50% of the time to see if it increases comfort of the house.
My question is whether there are any issues with letting the main blower do that as far as wear and tear on it. He seems to think the house feels more comfortable and that the AC hasn't needed to kick on. My only other issue with the idea is the main blower is noisier than the one in my high efficiency unit.
Is there any cause for concern with this?