Complete 1 system furnace repair and preventative maintenance check. Switch to emergency heat and heat strips working normally. It's a 10kw strip and total amperage draw from strips is 40. Switch to heatpump model and system is heating normal. Replaced dirty filter, test freon and within manufacturers charging chart. Outdoor about 48 degree and getting 108 psi on low side for 3.5 ton. Heating normal at this time. Found mold inside air handler, needs air purifier to eliminate bacteria and mold.