Customer stated no heat in all units. Found unit in the back is a gas furnace. Turned system on and it began to heat. Found the other 4 units are air handlers with no heater kits and outdoor units that are straight ac. Found all t stats don’t have a W wire hooked up. Informed customer of findings and reason there is no heat. Spoke with customer about options of installing heater kits or replacing systems for heat pumps. Informed customer just heater kits will not heat properly and will cause electrical bill to increase by a lot. Customer is aware of findings and solutions. Customer has elected to pay the service call fee and get back to us when he’s ready to make a decision. If customer calls back for repair we will build estimates at that time.