what energy is used for heating a building?
fire flow of protons wind HPV oil h2o condensation thermometers gas
A B C D E F G H
Heating system is Gas.
energy is used for heating a building by gas
what energy is used for heating a building? (A) fire (B) flow of protons (C) wind (D) HPV (E) oil (F) h2o condensation (G) thermometers (H) gas