Furnace Installation in Los Altos

Most Los Altos gas furnace installations run $4,500–$12,000, though larger or higher-end homes often land toward the top of that range, depending on furnace size, efficiency rating, and the condition of your existing ductwork — see our full furnace cost guide for a breakdown by system type. Air & Plumbing Systems (CSLB #901246) provides an exact, upfront quote for your gas furnace installation after a free in-home assessment — no guessing, no hidden fees.

Most single-family furnace installations in Los Altos are completed in one day. Because many Los Altos homes are older, established properties, jobs that also require ductwork repair or replacement may take a bit longer — we’ll give you a clear timeline during your free assessment.

Rising gas bills, uneven heating between rooms, frequent repairs, a yellow burner flame, or a furnace 15+ years old are the top signs — common in Los Altos’ older housing stock. A yellow flame or cracked heat exchanger is a safety issue — turn the furnace off and call us right away.

Yes. The City of Los Altos requires a permit for furnace replacement, and the install must meet Title 24 (the state’s building energy-efficiency code). We pull the permit and coordinate the inspection with the city as part of every install.

It depends on your home. A heat pump heats and cools with one system and, as part of Santa Clara County, can qualify for Silicon Valley Clean Energy (SVCE) rebates when it replaces a gas furnace. A gas furnace, on the other hand, tends to heat faster on Los Altos’ coldest foothill nights. The right choice comes down to your electrical panel, budget, and how the home is used — we’ll walk you through both options during your free assessment.

We offer same-day diagnostics for most Los Altos service calls, with most single-family furnace installs completed the day after your free assessment. Call (408) 733-2000 to get started.

In most cases, yes — reusing the existing location keeps ductwork, gas line, and venting connections simple and keeps costs down. Because many Los Altos homes were built decades ago, we do check that the current setup still meets code and airflow needs; if it doesn’t, we’ll flag it during your free assessment and walk you through the options.

Furnace size depends on your home’s square footage, insulation, window count, and layout — not on floor area alone. Older Los Altos homes in particular often have thinner insulation, which affects sizing. We run a Manual J load calculation during your free assessment so you get a furnace that’s sized correctly, not oversized or undersized.