Heaters
You may build your own heaters using these instructions: Building Home-made Heater Strips Or you may use any commercial heater strip which runs on 12V and has an RCA plug. Here are a few sources:  
MANUFACTURER WEB SITE NOTES
Dew-Not   Excellent heaters at a great price.
All are compatible.
Kendrick www.kendrickastro.com Premier and FireFly heaters are compatible.
Astrozap www.astrozap.com All are compatible.

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