Utility Cost Calculator

Last updated July 2, 2026

Utility costs are one of the most overlooked components of total housing cost, and they vary significantly between properties even at similar price points. A newer, well-insulated home might average $200 per month in combined gas and electric costs, while an older home with single-pane windows, poor insulation, and an aging HVAC system in the same climate might run $400 or more. For buyers comparing two similarly priced homes, a $150 monthly difference in utilities is $1,800 per year — $54,000 over a 30-year ownership period — a material figure that rarely appears in listing comparisons.

Before purchasing, asking the seller or agent for the prior 12 months of utility bills is reasonable and often productive due diligence. Most sellers will provide this information willingly, and the pattern across seasons reveals both the utility cost structure and potential signals about the home's thermal performance. Energy audits — typically $200 to $600 — provide a detailed assessment of where a home is losing heat or cooling and estimate the cost of improvements. Some utility companies offer free or low-cost energy audits. Homes in jurisdictions with time-of-use electric rates benefit from energy-efficient appliances and smart thermostats that shift consumption to off-peak hours, and these upgrades often pay for themselves within a few years.

Request the prior 12 months of utility bills from the seller before making an offer on any home. Factor the monthly utility cost into your total housing budget alongside mortgage, taxes, and insurance. A $150 per month difference in utilities between two comparable homes is real money over time and a legitimate factor in choosing between them.