OK my house has two heat pumps one on the west side of the house and one on the east side of the house. The one on the west side is fine, the one on the east side has started acting up intermittently sometimes the fan will not want to come up to speed and sometimes it has not problem. It seem that when it gets really cold the fan will try to start but can't get up to speed so it just bogs down. when it warm up a little it has no problem. I suspect the starting capacitor but ain't sure so what is your opinion.