(1) "Act of God" means an event caused solely by forces of nature without human involvement.

(2) "Energy usage" means the amount of energy used over a given period. The annual energy usage is determined by using actual or estimated heating cost over a twelve-month period.

(3) "Weatherization related imminent threat to the health or safety of a household" means any adverse condition in a dwelling that:

(a) relates to a structure, appliance, system, or equipment that directly and significantly impacts the dwelling's energy usage or energy conservation, including but not limited to the dwelling's primary water heating and/or space heating systems; and

(b) creates a serious and immediate risk to the physical health or safety of residents of the dwelling.

(4) "Weatherization services" means improvements, repairs, or other modifications made to a dwelling for the purpose of reducing a household's energy usage.