I’m comparing several proposals to replace an existing heat pump, but the quoted system prices are fairly close while the included work differs enough that they do not appear truly like-for-like.

For example, one proposal specifies a 3-ton heat pump rated at 15.2 SEER2 and 8.5 HSPF2, while another specifies a 3-ton system rated at 16 SEER2 and 9.0 HSPF2. A third is also listed as 3 tons but gives fewer efficiency details. The equipment line items are not dramatically different, so I’m trying to determine which scope differences should carry the most weight.

The proposals vary on whether they include:

- Duct transitions or other duct modifications
- Refrigerant-line replacement or pressure testing
- Electrical-disconnect or breaker upgrades
- Condensate-drain and thermostat changes
- Permit fees and inspection coordination
- Removal and disposal of the existing indoor and outdoor units
- System evacuation, refrigerant charge, airflow setup, and startup documentation

The warranty wording is also inconsistent. One contractor lists separate labor, parts, and compressor warranties; another only advertises the manufacturer’s parts warranty; and the third refers generally to a “full system warranty” without explaining who pays for diagnostic visits or labor if a covered component fails.

For those who have compared replacement quotes, which omissions or vague line items would make you reject a low bid? How do you verify that the stated capacity and efficiency ratings apply to the complete matched indoor/outdoor system rather than only one component? I’m especially interested in how members evaluate startup/commissioning, ductwork, electrical work, permits, and labor coverage when the base equipment prices look nearly identical.