My wife and I had a system installed by a licensed, reputable installer who has installed several systems for my family over the years. Not our only interview and not the cheapest, but seemed at the time to be the best qualified. Four months later and the system is just not running properly and sometimes not at all.
HP on first floor with LP gas as secondary and straight HP on second. Outdoor sensors on both. Second floor runs well with the exception of a few extremly noisy vents and returns, but that's a whole story in itself.
First floor runs intermittently, but many mornings it's just off. Thermostat says heating but no air flow. Contractor has replaced the outdoor sensor twice and it's still way off. We are in northern MD and it read 16F this morining. We are on the third thermostat with the latest installed today and it still doesn't run. We are not sure what to do and I think the technology is just too new for the installer. I can turn the system off and back on again and it will run, but never satisfys the thermostat and cuts off within a few degrees.
Not the thermostat or the outdoor sensor. Possibly incorrectly wired? Since the sensor temp is always way off I wonder if it's even worth it?