My home: [age, type, heating,
insulation]; bills [amount].
Rank improvements by payback,
say which popular upgrades pay
back slowly, and give the free
ones first.

Cut Energy Bills, Cheapest First

Ranked by payback, with the free ones first.

Prompt

My home is [describe age, type, heating and insulation] and my bills are [amount]. Rank the improvements by payback period, be honest about which popular upgrades pay back slowly, and tell me the free ones first.