Heating and cooling guides for Modesto
Written for a city that needs both a furnace and an air conditioner to work hard, in houses that were mostly built before anyone worried about duct leaks.
Each guide answers one question a Modesto homeowner actually has, with the local parts filled in: the City of Modesto and Stanislaus County permits, MID and TID rebates, the Valley's fog and smoke seasons, and what local companies generally charge.
What Furnace Repair Costs in Modesto (2026)
Modesto furnace repairs generally run $150 to $600 after the diagnostic visit, more for motors and boards. Part by part, and what moves the number.
No Heat on a Cold Modesto Night: The First Ten Minutes
Furnace out on a cold Modesto night: the safety checks first, then the five things that bring a furnace back, and what to write down before you call.
Do You Need a Permit to Replace a Furnace or AC in Modesto?
Replacing a furnace or AC in Modesto needs a permit, and Title 24 adds duct tests. What the city asks for, what it costs you to skip it, and MID rebates.
MID Rebates for a New AC or Heat Pump: What Qualifies in 2026
What Modesto Irrigation District's 2026 rebate catalog pays on air conditioners, heat pumps, mini-splits and thermostats, and the paperwork it asks for.
Furnace Filters for Valley Air: Fog Season, Smoke Season and MERV 13
Choosing a furnace filter for Modesto air: winter inversions, wildfire smoke, MERV 13, and how to tell whether an older furnace can take it.
When the AC Quits at 105°F: What to Do Before Anyone Arrives
AC out in a Modesto heat wave: protecting people first, the checks that fix it, what not to do to a struggling compressor, and what to tell the company.
Repair or Replace? Deciding on a 20-Year-Old Furnace in Modesto
How to decide on an ageing Modesto furnace: the repairs worth doing, the ones that are not, permits, heat pumps, and what to ask before replacing it.
Reading because something has already stopped working? Call and describe what it is doing. A local heating and air company will take it from there.
Describe the problem
Say what the system is doing and a local heating and air company will get back to you about a visit. Answered Mon–Sat, 8am–6pm · after hours we call back the same day Or call (209) 842-0950. If you have no heat or no cooling right now, calling is faster.
Which guide first
The titles do not always make it obvious, so here is the short version.
The furnace has stopped
Start with the first ten minutes, which puts the gas and carbon monoxide checks first, then the cost guide.
The AC has stopped in a heat wave
The heat-wave guide puts people first and lists what not to do to a struggling compressor.
You are replacing something
Read the permit guide and the MID rebate guide together; the rebate requires the permit. Then repair-or-replace, if you are still deciding.
The air inside is the problem
The filter guide covers MERV 13, smoke events and whether an older furnace can take a denser filter.