Heat pumps operate by moving heat from lower temperature areas to higher temperature areas. They typically take advantage of an electrically driven compressor and a closed vapor compression cycle.

Unspayed female dogs can have their first heat cycle anywhere between 6 and 15 months of age. During heat, which happens every six months or so and lasts a few weeks, your dog can get pregnant.

A heat pump functions as a typical air conditioning system in the cooling mode — absorbing heat from indoors and rejecting it outdoors. In heating mode, the coils reverse their functions. The outdoor ...