the temperature issue revisited

small "breeder" - for fum mostly - set up shop in a large - probably 120 sq.ft walk in closet - big house - have a 10,000 doll ar hvas unit in my house - zoned sytem, ie. i can set one of 3 different tstats - each one contrilling a veratin zone or area in my house - i said all that to suggest that i am blessed to have as good a beginning point as really could be expected - SO - my question is - - -what is the best, safest, cheapest, most practical way to heat, in the winter, the closet to a nice ambient temp that would allow my uth's to do their job - each choice potentially creates other issues - there are humidity concerns of course - so - i need ambient around 80 - as i expect most everyone else does too - how do i get it amd maintain comfortable temps in the balance of that "zone" - which happens to be my bedroom, bathroom and closet? - an oil filled heater?? - the their are potentially amperage issues if you claculate total wattage for 6 pads - numerous light, hair dryer, tv , etc then to add a high wattage oil filled - long post i know but how are others doing it - not big breeders - i know they have "rooms" just for their operation, but small operators, breeders, and hobby owners