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Furnace Repair, Installation and Tune-Ups in Sandwich, IL

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Forced-Air Heat, Handled End to End

A gas furnace is the most common way homes around Sandwich stay warm, and it is also the system most likely to be ignored until January. Just In Time covers the full life of that equipment: furnace repair when the heat goes out, installation and replacement when the old unit is done, and annual tune-ups that keep the safety checks current.

We install Armstrong Air, Ducane and Goodman furnaces, and our technicians service every other brand. Furnace work is safety work as much as comfort work, which is why our tune-ups include carbon monoxide testing and a heat exchanger inspection, not just a filter swap.

Every job is quoted with up-front pricing before we start, and replacements begin with a free in-home estimate. Call 815-768-4771 between 7:30 AM and 9 PM, seven days a week. Illinois License #055-043535.

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Our Furnace Services

Three services, one team, one phone number

Furnace Repair

No heat, short cycling, a blower that will not stop, or a burner that will not light. We diagnose with the right tools, check for gas leaks and electrical hazards along the way, and quote the fix before we start.

Furnace Repair

Furnace Installation & Replacement

Armstrong Air, Ducane and Goodman furnaces sized to your home rather than to the old unit's nameplate. Free in-home estimate, help identifying rebates and tax incentives, and a clean install that leaves the basement tidy.

Furnace Installation

Furnace Tune-Ups & Maintenance

A fall tune-up covering burner and heat exchanger inspection, blower motor and fan checks, cleaning and adjustment for airflow, carbon monoxide testing, and thermostat calibration.

Furnace Maintenance

Understanding Furnace Efficiency Before You Buy

Most of the price difference between two furnaces comes down to how they modulate heat and how much of the fuel they convert into warmth. The three Armstrong Air models we feature on our installation page illustrate the whole range.

Single-stage, 93% AFUE (A931E). One firing rate: full output or off. Simple, durable, and dual-fuel compatible. The right answer when the budget matters more than fine comfort control.

Variable-speed, 96% AFUE (A962V). A variable-speed fan motor smooths out the temperature swings a single-stage furnace leaves behind, and Comfort Sync A3 controls tie it to a matched thermostat.

Modulating, 98% AFUE (A98MV). The burner adjusts its output continuously to match demand rather than cycling on and off. ENERGY STAR certified, and the quietest of the three.

All three use Quiet Combustion technology. Which one fits depends on your home's heat loss, your ductwork, and how long you plan to stay, which is exactly what the free in-home estimate is for.

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Frequently Asked Questions About Furnace Service

We install Armstrong Air, Ducane and Goodman furnaces. Our featured Armstrong Air lineup runs from the A931E single-stage at 93% AFUE, through the A962V variable-speed at 96% AFUE, to the A98MV modulating furnace at 98% AFUE. We service all other furnace brands regardless of who installed them.

Book it in the fall, before the first hard freeze. A tune-up includes a carbon monoxide test, thermostat calibration, inspection of the burner, heat exchanger and blower motor, and cleaning of the components that affect airflow and heat distribution.

AFUE stands for Annual Fuel Utilization Efficiency. It describes how much of the fuel a furnace burns actually becomes usable heat in your home over a heating season. A 93% AFUE furnace turns 93 percent of the gas it burns into heat, and a 98% AFUE modulating furnace turns 98 percent into heat.

Weigh the age of the furnace against the size of the repair. A newer furnace with one failed part is worth fixing. An older furnace that has needed several repairs, struggles to hold temperature, or has a suspect heat exchanger is a replacement conversation. We give you both numbers in writing so the decision is yours.

Yes. During your free in-home estimate we identify available rebates and tax incentives that apply to energy-efficient furnace installations, and we handle the permits and inspections that Illinois municipalities require.

Heating Service Across the Fox Valley

We run furnace calls in Sandwich, Yorkville, Aurora, Sugar Grove, Plano, Oswego, Montgomery and Naperville. Heating with something other than forced air? See our boiler services or mobile home heating.

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Financing Options for Your Convenience

Flexible Financing Options for Your Plumbing & HVAC Needs

At Just In Time, we understand that heating, cooling, and plumbing repairs or upgrades can be a significant investment. That’s why we offer flexible financing options to help you get the services you need without financial stress.

Whether you’re facing unexpected HVAC repairs, a water heater replacement, or upgrading to an energy-efficient system, our affordable financing plans (upon credit approval) make it easier to manage costs while keeping your home comfortable.

Why Choose Our Financing Options?

  • Easy application process with quick approvals
  • Affordable monthly payments that fit your budget
  • Financing available for repairs, replacements, and new installations
  • Upgrade to high-efficiency equipment without upfront costs

Ready to explore financing for your HVAC or plumbing project? Contact Just In Time today to learn more about our financing options and keep your home running smoothly without breaking the bank.

Service Finance

Service Finance Company, LLC is a nationally licensed sales finance company and an approved FHA Title I Lender.

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Microf Finance

If you are ready to get your HVAC system replaced and keep your bank account intact, apply today with Microf.

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Our Featured Rebates

We work to bring you rebates that will help you make the changes or repairs that you need for your comfort.

Ameren Illinois Rebates

Energy-Efficient Product Incentives

  • Rebate of $125 for a smart thermostat purchase
  • Rebate up to $1,300 for the installation of a qualifying heat pump
  • Rebate up to $400 for the installation of a qualifying air conditioner
  • Rebate of $50 for a energy-efficient dehumidifier purchase
  • Rebate of $50 when you upgrade your gas water heater to a tankless system
  • Rebate up to $250 for the installation of a qualifying gas furnace
Nicor Gas Rebates

Nicor-Gas Residential Rebates

  • Rebate of $25 for the installation of a qualifying smart thermostat
  • Rebate up to $225 for the installation of a qualifying furnace
  • Rebate of $350 for the installation of a qualifying boiler
  • Rebate of $500 for the installation of a qualifying combination boiler system
  • Rebate of $150 for the installation of a qualifying tankless water heater

Home Heating & Cooling Discounts

  • Rebate up to $1,400 for the installation of a qualifying heat pump
  • Rebate up to $1,000 for the installation of a qualifying mini-split
  • Rebate of $100 for a smart thermostat

Our Featured Specials

We offer super specials to help you get the service you need for a little less.

$50 Off
Service Repair Over $299

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Restrictions apply. Call for more details.

Buy Now, Pay Later
3, 6, or 12 month Financing Options

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Restrictions apply. Call for more details.

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