



| What to Compare | Why It Matters |
|---|---|
| System sizing | Equipment should suit the home's heating and cooling requirements. |
| Model and features | Efficiency ratings, variable-speed options, and controls vary by model. |
| Installation scope | Confirm what's included and whether ductwork or electrical changes are required. |
| Warranty terms | Check the actual manufacturer warranty conditions and registration requirements. |
| Price and payment terms | Compare the full proposed cost rather than a headline price alone. |
| Start-up and testing | Ask how the installer checks system operation after completing the work. |