I have a carrier unit in the attic of my house it is about two years old. It was brand new when we bought it. The guy that installed it told me it had two heaters. The first year he put the unit in only one of the heaters was coneccted and would take forever to heat the house and was on all night long. After calling the ac guy back I explained to him and he connected the other heater. Now my house warms up but the heater is only on for about 20 min then the breaker trips. Every time I want to use the heater I have to reset the breaker and only works for about 20 min. what do I do in this case? Does the secound heater need its own cable with breaker?

Oner of three things, either your wiring was never made to meet the needs of this unit, the unit isn't functioning correctly or you have afulty breaker which is doubtful. Tell us the ratying of the braeker and what is the demand of the Carrier. A model might help