How Can I Be Sure I Am Ordering the Right System?

Start with proper sizing

Sizing is the first thing to verify. A system that is too small will struggle to keep up, and one that is too large will short cycle and waste energy. Heating and cooling capacity is measured in BTUs, and cooling is often listed in tons, where one ton equals 12,000 BTUs. The right size depends on your square footage, climate, insulation, windows, and ceiling height, not just the size of your old unit.

Match the fuel type and configuration

Make sure the equipment matches how your home is set up. A gas furnace needs a gas supply, while an electric furnace or heat pump runs on electricity. Confirm the orientation, such as upflow, downflow, or horizontal, and check that the airflow direction works with your existing ductwork and the space where the unit will sit.

Check the full system match

For split systems, the indoor and outdoor components should be matched so they perform as designed and keep their warranty coverage intact. If you are replacing only part of a system, verify that the new piece is compatible with what stays in place.

A simple pre-order checklist

Still not sure? Ask before you buy

If you are still unsure after reviewing the details, do not guess. You can review our Installation and Application questions or have a local contractor provide a free on-site estimate. You can also contact our product selection representatives, who are happy to help with technical or application questions so you order with confidence and the AC Direct Price Promise behind you.