Knowing the amount of energy, measured in BTU’s, is necessary to keep your home comfortable in the both heating and cooling seasons. There are several online resources with estimated BTU calculators. For your convenience, your WE LOVE FIRE expert has provided three tools for your consideration. The first two are merely “rules of thumb” that are often handy during our conversations with customers. The third BTU calculator is the best there is for fireplaces, stoves and inserts. It’s been developed by fireplace industry experts.