Heat pump never takes a break

I just spent a small fortune on a new HVAC system for my 2000 square foot house. I spent hours talking to HVAC professionals in my area about which size forced air heating system I needed for a house my size and was told that I needed a 3.5 ton heat pump. I had it installed about a month ago. Temperatures are starting to dip in my area this week, so I am really starting to to use the heat pump. Now I am beginning to get worried because ever since my heat pump started running to heat my home, it has never shut off. It really seems like it is running constantly and the temperatures outside aren’t even really that cold. I think it’s in the low 50s during the day and the mid-30s at night. It doesn’t seem like the heat pump can keep up with the low temperatures. I double checked the thermostat to make sure it was set properly. I know the system isn’t dirty because I just had it installed. So, I suspect that the heating system might not actually be the proper size for my home, but the HVAC professional who installed it promised me that it was the right size. Now, after finally getting my heat pump set up, I am going to have to call an HVAC technician already to have it looked at. If it turns out to be improperly sized for my house, I am not going to be happy. The HVAC company better replace it with a larger heat pump if that’s the case.

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