How to Read a Home's Energy Systems Before You Make an Offer

A system-by-system approach to evaluating heating, cooling, insulation, and windows before you commit to a purchase in Eugene.

A home is a collection of systems working together. Before you write an offer, it helps to separate those systems and look at each one on its own terms, rather than accepting a general impression of the property.

Start with the heating and cooling equipment. Find the age of the furnace, heat pump, or mini-split units. Ask when they were last serviced and whether any parts have been replaced. Equipment age alone does not tell the whole story, but it gives you a starting point for questions to the seller or their agent.

Next, look at insulation. This is harder to verify by walking through a house, since most insulation is hidden inside walls and attics. Ask for any documentation from past upgrades, energy audits, or contractor work. If nothing is available, that itself is useful information, because it tells you what still needs to be confirmed.

Windows deserve their own line of questions. Single-pane, double-pane, and upgraded low-emissivity glass all perform differently. Ask about the age of the windows and whether they have been replaced as a set or in pieces over time, since mixed installations can mean mixed performance.

Finally, consider the water heater and any ventilation systems. Tankless units, heat pump water heaters, and standard tank models all have different operating costs and lifespans. A ventilation system, especially in a tightly sealed home, affects indoor air quality and should not be overlooked.

Going system by system does two things. It keeps you from being swayed by a home's overall appearance, and it gives you a documented list of what is known, what is estimated, and what still requires verification before closing.