House a/c only freezes during the day works fine at night

It is meant to shut off when it gets so cold that the unit cannot make warm air from outside air that is too cold. When it reaches that situation, it should be switching the heating effort to the built in resistance heating. In other words, it gives up and directs that many KW of electricity go straight into heater coils, like and electrical dryer has. It is very expensive to heat this way. Most whole house heat pumps can't handle cold air. The newer mini split ductless heat pumps lower can work with outside air temperature below freezing depending on the manufacturer.

What year is your trailblazer ?

Dirty filter,undercharged, evap. coil plugged.These are some possibilities, also tstat may be set to low adjust to reasonable temp

You should turn the refrigerator off for a while to make sure the ice within melts. If you need spare parts, refer to the user manual for the appliance:
Frigidaire refrigerator parts manual

I suspect water in the fuel that is freezing up due to the pressure difference across the jet and causing a blockage.

The condensor is not cooling fast enough. Try cleaning the condensor coil. Also check that the fan goes on. At night the outside temperature is cooler and does not need much work to cool down the condensor.

If it works fine during the heat of the day, but as soon as it cools down, it freezes up, then you may have a low refrigerant charge. The other things you may check are the indoor filters to make sure they are clean, and check if you are getting good air flow through the vents. Bad air flow can mean you have a dirty evaporator coil if the filters are clean. If the above checks out ok, then you will have a low refrigerant charge and need a technician to come out and charge the unit. What happens is the low charge will cause the pressures/temps to drop inside the unit. When its hot enough outside and warm enough on the inside of the house, its enough to keep it from freezing, but as soon as the outside/inside temps drop, the refrigerant drops below the freezing point and starts to freeze. As for asking if its a problem, definitely. Hope this helps and good luck!

If your house is getting down to 64 and set at 66 then I would consider changing it. Is the stat old?

This is common for most air conditioners and is normal due to humidity levels being higher at night causing more condensation build up and then freezing. Solution: Turn down thermostat at night to allow compressor to turn on and off.

check the inside coil is dirtyor may be low on freon