#energy

Estimates annual cooling savings and simple payback period for solar window film based on window area, climate, and film effectiveness.

Sanity-check whether a contractor's proposed heat pump capacity is likely undersized, oversized, or reasonable for your home.

Estimate whether repairing or replacing your HVAC system is the smarter financial move based on age, efficiency, and quotes.

Compare annual operating costs of a standard AC system vs a heat pump (or hybrid) based on your climate, energy loads, and upfront cost difference.

Estimates whether replacing or repairing your windows makes better financial sense right now.

Ranks your insulation and air-sealing projects by payoff so you know exactly where to start.