Preventative maintenence inspection on Carrier air handler. Upon arrival, system was operating in heat pump heating. Performed non-invasive refrigerant test by testing refrigerant temperatures. Gas line temperature of 123F is within spec. Outdoor ambient temp of 35F and gas line should be 80-100F above outdoor temperature. No issues suspected with refrigerant. Tested operation of electric strip heat. All stips come on as should and operate within Amp draw specs. Blower motor is operating properly. Cleaned air filter and replaced tape to cover filter slot. No issues found or suspected with equipment. System is operating properly, efficiently and ready for Winter.