The lowest total is easy to spot. It takes more care to see whether each contractor has priced the same work. One proposal may include electrical changes and controls; another may leave those items for later.
Make a simple comparison with one column per proposal. Use the same questions for each contractor so missing information can be filled in before you decide.
Compare the installation as well as the equipment
ENERGY STAR's bid-comparison checklist includes equipment selection, duct and airflow considerations, installation checks and documentation. Those categories help turn a list of model numbers into a description of the completed job.
Record the indoor and outdoor models, capacity basis, thermostat and accessories. Then add supporting work: duct modifications, drainage, mounting, electrical work, removal of old equipment and restoration of affected surfaces.
Mark each item as included, excluded or still to be confirmed. A blank space should stay a question rather than becoming an assumption.
Compare how the job will be completed
- Installation timing and expected interruption to heating or cooling.
- Who coordinates any additional trades and required approvals.
- Commissioning checks and records provided.
- Manufacturer coverage and the contractor's workmanship terms.
- Payment stages, change approval and the point of handover.
For alternatives with different performance or features, ask the contractor to explain the benefit in terms of your rooms and routine. A quieter unit, better low-load control or a clearer maintenance arrangement can have value beyond the headline price.
Keep rebate estimates visible but separate from the full price until eligibility and approval are established.
Once the scopes are comparable, price becomes much more informative. You can choose the proposal that best meets the household's priorities and budget, with fewer unresolved items waiting for installation day.
