The best replacement for heat loss is heat gain.

The best alternatives to heat loss are rated as following:
★★★★★  heat gain
★★★  r value
★★  insulation thickness

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Speaking about heat loss, one probably shouldn't forget about ventilation.

Other search terms related to heat loss and their ratings are:
★★★★★ ventilation
You have in mind a companion for heat loss and it is not yet here? Propose!



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heat loss
heat gain
r value