Furnace Installation in Delano, CA
New gas, packaged and manufactured-home furnaces for Delano houses, sized to the home and to the air conditioner that shares the blower. The permit and duct testing are part of the job.
Furnace installation in Delano, CA is rarely just a heating decision. In many Delano homes, the furnace blower also pushes the air conditioner's air through a long, hot summer, and the AC coil sits right on top of the furnace cabinet. So we size a new furnace to two things: your home's heating load and the airflow your AC needs.
We install new furnaces and replace old ones in closets, garages and attics, on roofs and in manufactured homes. That covers the venting, gas and electrical changes, the permit, the Title 24 duct test, and hauling the old unit away. Call or reach out through our contact page to set up an in-home evaluation.
Findings That Usually Mean a New Furnace
Age by itself doesn't settle it in Delano, where a furnace may run only a few months a year. These findings usually do.
| What we find | Why it usually points to a new furnace |
|---|---|
| A cracked or rusted-through heat exchanger | It's the wall between the flame and your air. Combustion and CO testing confirms it, and replacing only the heat exchanger rarely makes sense on an older furnace. |
| A discontinued control board, gas valve or inducer | Every repair becomes a search for used or universal parts, and the next failure may not have a fix. |
| A blower too weak for the AC | This happens when a larger AC was added to an older furnace. Rooms stay warm all summer because the blower can't move enough air across the coil. |
| SoCalGas left it off for a heat exchanger or venting problem | On an older furnace, that kind of repair often turns into a replacement conversation. |
| It was the wrong size from the start | An oversized furnace short-cycles through Delano's mild nights, and no repair changes its size. |
If the problem may be a single part, start with a furnace repair diagnosis. If the AC is near the end too, see replacing the whole heating and cooling system.
Six Decisions When Picking a New Furnace
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How big?
We run a Manual J heat-load calculation, but Delano's heating load is often modest. The tighter limit is usually the blower: it has to move enough air for your AC on 100°F afternoons, and Delano averages about 34 of those a year (NOAA 1991–2020 normals). An oversized furnace short-cycles on mild nights.
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80% or 90%+ efficiency?
The federal minimum is 80% AFUE for most gas furnaces and 81% for packaged units.
- 90%+: a condensing furnace burns less gas, but it needs PVC venting to the outside, a condensate drain, and sometimes a second pipe for combustion air.
- 80%: with Delano's short heating season, the extra cost of 90%+ takes longer to earn back than in colder towns. An 80% furnace can still be the right call, especially when it can reuse a sound metal vent.
- Federal rules: minimums for new gas furnaces are under review, so our pros confirm what applies to the model you pick.
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Single-stage, two-stage or variable-speed?
Staging controls the burner; a variable-speed (ECM) blower controls the air. The blower also runs the AC all summer, so in Delano a variable-speed blower often makes the bigger difference. It's quieter, gives steadier airflow and uses less electricity than an older blower motor.
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Upflow, downflow or horizontal?
The location decides:
- upflow in hall closets and garages
- horizontal in attics
- downflow in manufactured homes that feed ducts under the floor
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Split or packaged?
If heating and cooling share one cabinet on the roof or a ground pad, the replacement is a packaged gas/electric unit. Not sure which you have? Call and ask our pros.
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Does it meet the Valley's NOx rule?
Every new natural gas furnace sold or installed in the San Joaquin Valley must meet the Air District's 14 ng/J NOx limit (Rule 4905). Every model we quote meets it.
We install Carrier, Goodman and Lennox furnaces, along with other major brands, and the proposal lists exact model numbers.
We also install the gas furnace half of a dual fuel system, where a heat pump handles mild weather. If you'd rather leave gas behind, see what switching to a heat pump involves. For electric furnaces or a setup not listed here, call and ask our pros.
What Changes When the Old Furnace Comes Out
In a typical Delano hall closet, the old 80% furnace shares a metal flue with the gas water heater and has the AC coil sitting on top. Each of those connections gets checked.
| Item | What we check | What may change |
|---|---|---|
| Vent | Flue size and condition, and whether the water heater shares it | A 90%+ furnace vents in PVC through a wall or roof. The water heater left on the old flue may need it resized or lined so it still drafts. |
| Combustion air | Openings into the closet or garage | Added openings or a louvered door, or a sealed two-pipe setup on 90%+ units |
| Gas line | Pipe size, shutoff valve, sediment trap | A new shutoff and sediment trap, or a larger line for a higher-input furnace |
| Electrical | Furnace circuit and service switch | A new switch or circuit |
| AC coil and cabinet | Coil width, and blower airflow for the AC's size | A transition piece or a new coil. A newer R-454B or R-32 coil can require a leak-detection sensor wired to the furnace. If the AC itself is due, see replacing the air conditioner at the same time. |
| Condensate (90%+) | Where the water can drain | A drain line or condensate pump. Attic units get a secondary pan. |
| Ducts at the furnace | Plenum and return connections | New transitions, then the Title 24 duct sealing and leakage test |
| Thermostat | Whether it can run a two-stage or variable-speed furnace | A compatible thermostat |
Furnace Installation in Seven Stages
| Stage | What happens |
|---|---|
| 1Your call | Call or reach out through our contact page. Tell us where the furnace is, its age if you know it, whether an AC coil sits on it, your home's size, and access details such as a gate code or attic hatch. |
| 2Evaluation at the house | A technician measures for the heat load and checks the AC's size and coil, the flue and water heater venting, the gas line, the electrical, the ducts at the furnace, and whether smoke and CO alarms are in place. |
| 3Written proposal | Model numbers, AFUE and staging for each option. It also lists the full scope (venting, gas, electrical, coil work, duct sealing, permit) and what's not included. Nothing is ordered until you approve it. |
| 4Permit | We pull the mechanical permit with the agency that covers your Delano-area address. |
| 5Install day | The gas is shut off and the line capped, the old furnace comes out and the new one is set. Then the venting, gas, electrical, condensate, coil, plenum and thermostat are connected. |
| 6Firing and testing | Gas pressure, temperature rise, combustion and CO readings, safety switches, and airflow in both heat and cool. Then the duct leakage test, verified by a third-party ECC-Rater. |
| 7Inspection and handoff | The city or county inspector signs off. We show you the thermostat and filter, haul the old furnace away and clean up. |
Why Delano Furnace Installs Differ from Colder Towns
- 38°F Average January low
- 2 in 3 Homes heat with utility gas
- 1989 Median year homes were built
- 4 in 10 Homes built before 1980
- 4% Mobile or manufactured homes
Delano's average January low is about 38°F (NOAA 1991–2020 normals). A furnace here heats for a few months and moves cooling air for many more. So blower size and blower motor often matter more than squeezing out the last point of heating efficiency.
About two in three Delano homes heat with utility gas from SoCalGas, and the median home was built around 1989 (Census ACS 2020–2024). In homes of that age, the original flue and ducts often stay in place through several furnaces, which is why the vent and duct checks above matter. About 4 in 10 homes were built before 1980, and some of those have asbestos-wrapped ducts or flue pipe. If we find suspect material, we stop and explain the options before work continues.
Fine dust is part of Valley air year-round (the San Joaquin Valley is a federal nonattainment area for fine particulates), so we size the filter rack at the new furnace for a deeper filter when the return allows. About 4% of Delano homes are mobile or manufactured homes. They need furnaces that keep combustion air sealed off from the living space.
What Goes Into the Price of a New Furnace
As a general estimate, most gas furnace replacements cost several thousand dollars. High-efficiency condensing furnaces and extra venting, gas line or duct work push the total higher. These are general estimates, not actual prices. Your actual price depends on your home and the furnace you choose.
What changes the price:
- 80% or 90%+ efficiency, and single-stage, two-stage or variable-speed
- venting changes, including a water heater vent that needs resizing or a liner
- gas line, electrical and condensate work
- whether the AC coil fits or needs a transition piece or replacement
- duct sealing to pass the Title 24 test
- location: Delano attics and rooftop packaged units take more work than a hall closet
- the permit and ECC-Rater verification
The Permit, the Duct Test and Smoke and CO Alarms
Replacing a furnace needs a mechanical permit, and we pull it. Depending on the address, it comes from the City of Delano, Kern County, Tulare County (for homes north of the county line), or California HCD for manufactured homes. If you're not sure which applies, call and ask our pros.
Under California's 2025 Energy Code (Delano is in Climate Zone 13), a new furnace counts as a new air handler. So the ducts are sealed, leakage-tested and verified by a third-party ECC-Rater.
Exempt: duct systems under 40 feet, ducts already sealed and certified, and ducts that contain asbestos.
California won't let a permit like this be signed off until working smoke and carbon monoxide alarms are in the home. Ask our pros what paperwork your permit needs.
What Delano Homeowners Ask Before Replacing a Furnace
Can I replace my furnace and keep my air conditioner?
Usually, yes, if the AC coil fits the new furnace cabinet and the new blower can be set for your AC's size. We check both at the evaluation. If the coil has to be replaced, a newer R-454B or R-32 coil may need a leak sensor wired to the furnace, and that goes in the proposal.
Is a 90%+ furnace worth it in Delano's mild winters?
Sometimes. It uses less gas, but Delano's heating season is short, so the savings build slowly, and the PVC venting and condensate drain add cost. It tends to make more sense in a larger home, when the old vent needs work anyway, or if you plan to stay a long time. We price both so you can compare.
What happens to my water heater vent if I switch to a high-efficiency furnace?
A 90%+ furnace vents through its own PVC pipe. That leaves the water heater alone on a metal flue sized for two appliances, which may be too large for it to draft properly. We check the flue and resize or line it when needed.
Where does the water from a high-efficiency furnace go?
A condensing furnace makes water as it burns gas. It's piped to a nearby drain or a small condensate pump, and an attic furnace also sits over a secondary pan.
What is the Valley Air District's NOx rule for new furnaces?
Rule 4905 says every new natural gas furnace sold or installed in the San Joaquin Valley must emit no more than 14 nanograms of NOx per joule. Furnaces built for the Valley meet it, and installers have to keep records. Every model we quote complies.
Why will the inspector look at my smoke and CO alarms?
California requires working smoke and carbon monoxide alarms before a permit for work like a furnace replacement can be signed off. It's a standard part of the final inspection, so it helps to check them before install day.
I already have a heat pump. Can you add a gas furnace as backup?
Yes, if there's a gas line to reach. In a dual fuel setup, the heat pump handles mild weather and the furnace takes over below a set outdoor temperature. We install the furnace side and make sure the thermostat can switch between them.
Why can't a standard furnace go in my mobile home?
Federal manufactured-home rules require the furnace to keep its combustion air sealed off from the living space. Most manufactured homes also use a downflow furnace feeding ducts under the floor. A replacement has to be built for that setup. Call with the model number from your current furnace, and our pros will confirm the options.
Why do my ducts get tested when only the furnace is replaced?
Under California's energy code, a new furnace counts as a new air handler. That triggers duct sealing and a leakage test verified by a third-party rater. Ducts under 40 feet, ducts already sealed and certified, and ducts that contain asbestos are exempt.
Do I need a new thermostat with a new furnace?
Not always. A basic thermostat can run a single-stage furnace. A two-stage furnace, a variable-speed blower or a dual fuel setup works best with a thermostat that can control those stages. If yours can't, we'll note it in the proposal.
What happens to my old furnace?
We shut off and cap the gas line, remove the old furnace and haul it away. If we find suspect asbestos on an old flue or duct wrap, we stop and explain the options before going further.
Furnace Replacement Evaluations in Delano
Tell us where the furnace is, roughly how old it is, and whether your AC sits on it. We'll set up an evaluation and send a written proposal.
- HoursAvailable 24/7
- AreaDelano, CA and surrounding Central Valley communities
- Address901 Jefferson St, Delano, CA 93215