We start with a heat load calculation, not a guess. A lot of installers swap in the same-sized unit that was there before, but that old system might have been oversized or undersized from day one. We size based on your actual home: square footage, insulation level, window area, and ceiling height all factor in. From there, we recommend the AirQuest unit that fits your budget and efficiency goals without pushing you toward a higher-efficiency model if your home won't benefit from it. Honestly, a 96% AFUE furnace saves you more money in a drafty older home than in a tight, well-insulated newer build, and we'll be upfront about that. Once we've agreed on equipment, we pull the permit, schedule the installation, and the crew shows up on the agreed date. Most residential furnace replacements are completed in a single day. We haul away the old equipment, commission the new system, walk you through what changed, and Jason does a final walkthrough before we leave. After that, you register the equipment, and your warranty coverage is active.