And, how much shorter does shorter really equate to? In the area that I'm in, the heat is used from probably mid-october thru late April. May and June are usually freebie months, as would be Mid September to at least Mid October. So assuming that's three months right there w/ no activity, and 2/3 duty during the other 9, I wonder how long on average it would last before I have to pull it out?
If in the end it wasn't worth it b/c you have to switch the unit out faster (thereby spending more money in equipment costs), that to me would be a big gotcha.