— Customer states system is not satisfying on heat mode. System only blows cold air. — Compressor and outdoor fan run with call from thermostat. Signs of freezing at suction line, indicating probable low refrigerant charge. Pressures confirm low refrigerant levels. Observed signs of leaking from low pressure service port. — Recommend performing system leak search to identify source of refrigerant loss. Provided estimate for leak search. — System uses obsolete R22 type refrigerant, with a system capacity of 7 lb. Tech does not stock R22 on truck, and may not have enough on hand to recharge system to satisfactory levels. Provided estimate for 4 lb of R22. If customer elects to charge system, there is no guarantee on how long system will operate until it leaks back out to levels unable to work properly. — Customer gave verbal approval for leak search so she can make a more informed decision on how to proceed. Tech confirmed loose schrader valves at service ports & tightened as appropr