Compare repair and replacement, obtain design loads, check actual output and distribution and agree installation and handover evidence.
Record the equipment identity, service history, actual faults, comfort concerns and recent energy records. Have a qualified contractor assess the system, including combustion and venting where applicable. Compare a documented repair scope with replacement options rather than treating age alone as a replacement instruction.
Request a suitable building-specific load assessment using actual envelope, weather, infiltration, ventilation and distribution conditions. If documenting individual heat-transfer components, use measured net areas and appropriate whole-assembly U-factors. Review the complete report with the designer, including room needs and assumptions.
For each candidate furnace, identify delivered output rather than fuel input and compare it with the documented design load. Review minimum firing or modulation, duct airflow, return paths, controls, fuel and venting compatibility with the contractor. Check actual filter products at the system’s required airflow and assessed pressure allowance.
Request complete quotes for equipment, labor, fuel and venting work, distribution repairs, controls, permits, disposal and commissioning. For an alternative heat pump or furnace scenario, use a documented delivered-heat basis, explicit seasonal efficiency and current tariffs. Compare maintenance and service-life assumptions separately when using a lifetime-cost model.
Use qualified installation under the actual permit, fuel, venting, electrical and manufacturer requirements. Agree what documentation will demonstrate proper setup, airflow, controls and safe operation. Have the contractor resolve existing system defects and record approved changes rather than improvising from generic wiring or connection instructions.
Retain exact model and warranty information, inspection and commissioning outcomes, filter specifications and maintenance instructions. Confirm how the household operates the controls and obtains service. After a representative period, review comfort, noise, cycling and actual energy records with their weather and occupancy context.
Keep the condition assessment, fault evidence, repair proposal and questions about safe continued operation. · Retain the actual load report, design conditions and unresolved envelope or distribution questions. · Keep the approved scope, installation responsibilities, inspection requirements and commissioning evidence to request. · Keep the handover record, maintenance tasks and observed issues for follow-up.
Use Steady heating loss components only to total explicit U-area-temperature and outdoor-air components; it is not a complete Manual J report.
Compare documented heating load and equipment output on matching design conditions.
Compare actual MERV labels and product pressure drops at a common airflow against the assessed filter allowance.
Compare entered seasonal heating energy costs using an explicit load and equivalent full-load-hours basis.
Build complete installed quotes and, where useful, compare lifetime costs using documented annual costs and a common horizon.
Update the household budget using actual recurring costs and completed project payments.
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ENERGY STAR quality-installation guidance emphasizes actual sizing, airflow, refrigerant checks where relevant and duct evaluation.
EPA explains MERV particle-capture ratings and recommends considering what the actual system fan and filter slot can accommodate.
ENERGY STAR’s heat-pump guidance describes sizing, component matching and installation considerations; verify current financial incentives separately.
Fuel input and delivered heating output are different quantities.
A capacity comparison is meaningful only when the load and output assumptions match.