Performed 2 system heating maintenance on 2023 propane gas furnaces. I checked amps, capacitors, filters, drains, electrical connections, electrical components, and cleanliness. The systems are heating to manufacture specifications. I had a couple of recommendations to improve efficiency and safety. Recommendations 1. The house has lower than Department of Efficiency recommends for standard level of insulation. I spoke with the customer and he acknowledged that the levels are low. Customer is not ready to move forward with insulation at this time. 2. To prepare for the summer, I advise that drain treatments be performed to ensure that the drains are clean. 3. The systems currently have primary drain float switch (ss1). I advise that we add an additional float switch to serve as a back up in the case of failure of the primary float. (Ss3)