And to add a little more, even though it is probably not relevant in this situation, cooling is just as important as heating. Those of us in warm climates have to contend with indoor temperature spikes. I spend far more effort and money cooling than I do heating. My ac died this summer and I ended up having to pay through the nose to get a new one immediately. Temps easily reach 95 inside my house in the summer without AC. Heat will kill a ball faster than cold will.