Estimate the energy savings and payback of new windows.
Total window cost divided by their combined annual energy savings gives the payback period, while years of savings minus the cost shows the net benefit of staying. Efficient windows also cut drafts and noise, but the hard number is whether the energy savings outlast the installation cost in your stay horizon.
Window Replacement Payback
Payback = total cost / annual savings; net by stay = savings x years - cost
Payback = total cost / annual savings; net by stay = savings x years - cost Total window cost divided by their combined annual energy savings gives the payback period, while years of savings minus the cost shows the net benefit of staying.
Efficient windows also cut drafts and noise, but the hard number is whether the energy savings outlast the installation cost in your stay horizon.
This calculator takes 4 inputs: Windows replaced, Cost per window, Energy saving/window, Years you'll stay. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.