Capacity and equipment
Which equipment even makes sense depends on the measured load, how it stages or modulates, how it performs in cold weather, and what fuel or electrical service the house already has.
Distribution and access
Getting new equipment connected to an existing house—through ductwork, radiators, piping, venting, and condensate routing—often adds more cost than the equipment itself, especially with finished walls or tight attics involved.
Controls and completion
Thermostats and zoning, permit fees, disposal of the old equipment, startup testing, and warranty terms should all show up as their own line items, not vague assumptions.
Planning note
Treat any number on this page as background for a conversation, not a quote—ask for a written, site-specific proposal before comparing totals.