There are many examples like this, where we can spend public money once and get multiple returns. With subsidies for home insulation you get emissions reductions, and you lift the standard of living of both the residents and insulation workers.
Plus, you get reductions in energy use (home heating is a huge chunk of domestic energy use), and if any of the energy production freed up is offshore owned, it shifts the country's balance of payments, so it can import more for the same money.
(2/2)