Arrived to do blue club maintenance for customer was greeted at the front door where I was shown where both systems were located and also where the thermostats were located. Both systems were running heat when I arrived. While preforming maintenance on both systems I checked all motors for proper operation, voltage and amps, checked all electrical connections, flame sensor, ignition cycle, gas valve, blower wheel, gas pressure, safeties, pressure switch, temperatures, and did a carbon monoxide check also changed filters, vacuumed around and inside heaters. Systems working properly at this time with no repairs needed. Units did not have surge protectors on them and would be beneficial for extra layer of protection for electrical components in heaters.