Connect diagnosis and building-specific sizing with explicit seasonal energy assumptions, installed quotes and commissioning checks.
Collect equipment model numbers, service history, comfort complaints and a full seasonal utility record. Ask a qualified technician to identify the failure and the cost and scope of a repair. Consider equipment condition, refrigerant and parts availability, comfort and planned building changes without using age alone as a replacement rule.
Ask the contractor for documented load calculations, such as Manual J for a relevant US home, and equipment selection matched to local design conditions. Review duct condition and airflow, electrical capacity, drainage, equipment clearances, noise and low-temperature heating performance. Include planned air sealing or insulation changes in the design assumptions.
Use Seasonal heating and cooling costs only when the reference thermal loads and equivalent full-load hours have a documented basis. Equivalent hours convert seasonal delivered energy to the stated load basis; they are not thermostat runtime. For gas-versus-heat-pump options, compare the same heating demand, applicable tariffs and excluded fixed or maintenance costs.
Get written quotes for matched equipment and the same duct, controls, electrical, drainage, removal, permit and commissioning scope. Build payment-day cash needs in Installed project quote, then compare initial and annual costs over a shared horizon in Compare lifetime project costs. Save a case with less favorable energy or maintenance assumptions.
Agree the permits, inspections and commissioning records before work starts. Ask for measured airflow, refrigerant charge checks where relevant, drain testing, operating mode and control verification, and the exact installed model match. Use appropriately qualified personnel for the work and applicable refrigerant handling.
Keep the equipment manuals, warranty and service contacts. Set filter, coil, drain and service tasks from the actual product instructions and conditions of use. Record comfort, noise and bills after a representative period and investigate unexpected changes with the installer. Refresh the cost case with actual evidence.
Record the diagnosis, repair quote, model identities and the problems a new system must address. · Keep the load and equipment-selection report, site requirements and unresolved duct, electrical or condensate work for the installation bid. · Prepare an acceptance record for the contractor measurements, inspections, operating demonstrations and any deferred checks. · Keep product-specific maintenance tasks and a log of comfort issues, actual service and unresolved performance questions.
Use Compare observed bill averages when two reconciled bill periods are available; retain metered energy, weather and tariff information alongside the cost comparison. · Compare same-scope bill totals over complete calendar months before and after installation; keep recorded energy use and weather context separately.
Calculate electricity and energy cost from entered thermal loads, equivalent seasonal hours and compatible SEER/SEER2 and HSPF/HSPF2 ratings.
Compare heat-pump and gas annual operating costs with explicit heating hours, tariffs, AFUE and additional costs.
Compare itemized installation cash needs and whole-horizon present costs in separate modes; neither mode guarantees energy savings.
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Ask for a home-specific load calculation and equipment match; the old unit size or floor area alone is insufficient.
Use exact equipment ratings and explicit seasonal demand assumptions. Test ratings and local operating conditions differ.
Installation quality includes design, airflow and appropriate refrigerant charge verification, with records of the actual work.
Tell the designer about planned insulation, air sealing or window changes before equipment sizing.
A gas therm, electricity kWh and heating Btu are different quantities; retain every tariff conversion.