About MRCOOL MrCool Parts are the cutting edge of what modern, flexible fabrication can produce. This Electric Heat Kit relies on state-of-the-art manufacturing processes and advanced design to deliver high efficiency air comfort when you need a new part. 15kW Electric Heat Kit for MrCool Signature Package Unit - Exclusive Seller of MRCOOL Parts - Will you need a little extra heat this winter? Let this 15kW heat kit help you through the colder months when installed in the MrCool Signature Package Unit This Heat Kit should be used with the MrCool Heat Pump Package Unit and the MrCool Electric A/C Package Unit The 15kW Heat Kit can be used with the 30K, 36K, 42K, 48K, and 60K Package Units