does changing the radiator and thermostat affect the inside heating temperature?

Yes, I have no heat and i had heat before. Does the new thermostat requires a reset? Or could it be a fuse?

Air in the coolant system may have accumulated in the heater core. Park the car nose up on a small steep grade (or raise the nose and put on jackstands) and run the car with the heat and A/C on full until the temp guage indicater is in the middle. This should help move the air through the system to the radiator. It may also help to have the coolant reservoir cap off...but be sure to do this before you start running it to avoid overflow and dangerous steam.