Don't know if you have fire ants where you live but if you do check the electricals for those bastards- they get in the contacts and can play hell. Check reset buttons too and if one is tripped make sure all the fans are freewheeling and working. Had a squirrel cage start locking up on me one time and it popped the reset button out. Also, try turning the breaker on with the unit off inside the house, then try the heat first, then A/C to see which side of the sucker is tripping the breaker. Nice-ass house, very clean looking. Where is MA N.C.? Let us know what they find out...