In my opinion (well, fact really), the effectiveness of back-heated racks is compromised when the room temps are under 72 deg. Some colubrids would do fine with that, but boas/pythons should use belly heat if room temps are in the low 70s or below.

Covering the rack front with insulating material (styrene foam sheet for example) might help alot during cooler temps. Use a thermostat however if doing this.

There are portable oil-filled room heaters available that work really well. You will be able to keep the room warm enough so that back heat is effective during the coldest times of the year.

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