Tech arrived and found customer had gas heater and home was 85 degrees, tech cut system up to come on and tech found auxiliary heat would get call but would not power on, tech found that power to heat strips was only getting 100v, tech checked main panel and found breaker sending 240v. Tech informed customer they would need to contact an electrician to find where voltage drop is occurring. Tech spoke with customer about energy savings and customer purchased MPA, draft payment from account associated with check. Tech noted ductwork is old in rough shape, also a few vents in home are covered. Mail hardcopy of invoice to customers address.