Have mine ready, but didn't have to hit the button yet. Tank is 78-79.5 all year. In the hard and expensive summer months I set my A/C to energy saver and thermostat to 79, then I close both doors to living room (yeah, I've put those folding doors so the cool air stay in the living room). Worked for me so far.
i put mine in on monday after a long holiday weekend of camping and quading, tank was at............ dare i tell you guys................... 83 :frown: