Heating maintenance in Roswell. Tested operation of 1 furnace. All electrical components tested within normal manufacturing spec. System is under firing and needs to be calibrated. System and occupant health would greatly benefit from ultraviolet light system to combat organic and viral growth with every bit of air inside home being circulated through system 4 times an hour on average. System has no drain line water safety to help prevent flooding of the furnace in the case of common drain line clogs. System heating at this time. Stalled drain line water safety and calibrated furnace.