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this model number you gave is for an electric furnace , most often its found in mobile homes , if its undersized for the load of the home a larger unit is needed , if I look at this one right here , it says this one will provide 3.6 tons of heat this size will only heat a small area (about 15x25x7 feet ) and wall insulation will help increase this too , also the wall thermostat will " cycle" the heater on an off due to demand , if its placed in a drafty spot then that will affect proformance as well
I,t sounds like you had a leak, and pulled air into the system. This calls for professional servicing. Whenever there's a leak in a refrigeration system, air and sometimes other noncondensables get pulled into the system. They don't belong there. They cause heat and high pressure in the condenser, and will eventually destroy the compressor. The system needs dehydration and evacuation before charging. That's after all leaks have been repaired.
Doesn't matter how hot it was when installed, there still should have been proper start up performed. That means running unit thru all cycles and checking charge. If it was installed this summer then installer should warranty service to return and complete install properly.
firstly is the air comming from the outdoor unit cold or warm? if it is cold then the 3way valve is working and it has changed to heating. If it stays warm then it is still in cooling mode. The indoor fan wont come on until the coil temp gets warm enough, ( so it doesnt blow cold air on you straight up). If it is changing into heat mode then the larger of the pipes connected to the outdoor unit should get warm/ hot. If this is not happening then the unit is either out of gas or the compressor is on hollidays and wont come back to work.