Algonquin, IL Heating & Cooling

Furnace and AC Replacement in Algonquin, IL

Algonquin had 11,663 residents in 1990 and 23,276 in 2000. It doubled in a decade and kept going, to 30,046 by 2010. That puts a lot of furnaces and air conditioners installed during the boom at or past replacement age right now.

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  • McHenry & Kane County sides
  • Nicor Gas Contractor Circle member
  • ComEd Heat Pump-Trained
  • 24/7 emergency service

The Boom-Era Replacement Window

15–20 years

Furnaces

A residential furnace lasts 15 to 20 years.

12–17 years

Air Conditioners

An air conditioner lasts 12 to 17 years.

17–36 years old

Algonquin’s 1990–2009 Homes

Equipment original to a home from the growth years is 17 to 36 years old, and builder-installed units weren’t chosen for efficiency.

Willoughby Farms, Brittany Hills and Manchester Lakes Estates were all built out between 1990 and 2008. If your system is original to one of them, it’s on borrowed time.

How We Decide Between Repair and Replacement

We do not push replacement on a furnace that has a cheap fix left in it. The rule we use is simple: if a repair costs more than half of what a new system would, or the unit is past 15 years and this is the second or third repair in a couple of seasons, replacement is the better spend. Most common furnace repairs in our area (igniter, flame sensor, pressure switch, capacitor, inducer motor, control board) typically land between about $300 and $1,800, and most AC repairs (capacitor, contactor, fan motor) between $300 and $1,400. A cracked heat exchanger or a failed compressor on a 20-year-old unit is where the math flips, and we show you that math rather than just telling you the answer.

When replacement wins, here is what changes. An 80% furnace from the boom years becomes a 95% or 97% AFUE condensing furnace that vents in PVC and earns the Nicor Gas discount. A builder-grade air conditioner on R-22 or R-410A becomes an R-32 system matched to the new furnace, and a cold-climate heat pump becomes an option worth pricing, with ComEd taking $900 to $2,000 off. We haul the old equipment away, file the village permit, register the warranty and hand you a written quote before any of it starts. The furnace replacement and AC replacement pages walk through the day itself, and dual fuel explains how a heat pump and a gas furnace share the work.

Upstairs Hot, Basement Cold

It’s the most common complaint in two-story homes of this era, and a bigger air conditioner is rarely the fix.

Measured

Airflow and Duct Leakage

We test with Minneapolis DuctBlaster equipment, so the recommendation is based on numbers, not guesses.

Balanced

Returns and Dampers

Undersized upstairs returns and unbalanced supply runs are frequent causes. Sometimes the fix is in the ductwork, not the equipment.

Variable speed

Right-Sized Equipment

Variable-speed and inverter systems run longer at lower output, which evens out temperatures between floors instead of blasting and shutting off.

Permits in Algonquin

The Village of Algonquin issues specific permits for furnace and air conditioner replacements. Work can’t start until the permit is issued, and inspections follow. In the village’s Historic District, the Historic Commission reviews applications before plan review.

We file the permit where the municipality requires one, build the inspection into the schedule, and include it in the quote so the price you approve is the price you pay.

Algonquin HVAC Services

Furnace and AC replacement is the main event for boom-era homes, but the same crew handles repairs on any brand, heat pumps, airflow and duct-leakage testing for uneven floors, seasonal tune-ups, whole-home air quality and ductless for bonus rooms and additions. Every service below is available on both the McHenry and Kane County sides of Algonquin.

24/7 no heat

Furnace Repair in Algonquin

Igniters, flame sensors, pressure switches, blower motors and control boards on every major brand, with a flat-rate price approved before the work.

Nicor discounts

Furnace Replacement in Algonquin

High-efficiency Amana and Daikin furnaces with the Nicor Gas instant discount taken off the invoice and the old unit hauled away.

All brands

AC Repair in Algonquin

Capacitors, contactors, fan motors, refrigerant leaks and frozen coils diagnosed and repaired on any brand of central air.

Free quotes

AC Replacement in Algonquin

Written quotes on R-32 replacement systems, matched to your furnace or air handler and sized to the house.

ComEd discounts

Heat Pump Installation in Algonquin

Cold-climate inverter heat pumps that keep heating below zero, with the ComEd instant discount taken off the invoice.

Hot-water & steam

Boiler Repair in Algonquin

Cold radiators, kettling, pressure problems, circulators and controls on hot-water and steam boilers of any brand.

No ductwork

Ductless Mini-Split Installation in Algonquin

Daikin single- and multi-zone systems for homes without ducts, additions and rooms the main system never reaches.

AprilAire

Indoor Air Quality in Algonquin

Whole-home humidifiers, dehumidifiers and media air purifiers installed on your existing furnace or air handler.

Any hour

Emergency Furnace Repair in Algonquin

No heat on a January night is not a wait-until-morning problem. We answer 24/7 and quote the after-hours rate before dispatch.

Any hour

Emergency AC Repair in Algonquin

AC not cooling in a heat wave, ice on the lines, or a dead condenser: same-day and after-hours response across the Fox Valley.

$240 / year

Maintenance Plan in Algonquin

A spring cooling tune-up and a fall heating tune-up, one free business-hours service call, priority scheduling and 5% off services.

We also handle air handler repair, smart thermostat installation, humidifier installation, dehumidifier installation, air purifier installation, duct cleaning and dual-fuel heat pump and furnace systems in Algonquin. Not sure which page fits your problem? Call (847) 224-2420 and describe what the system is doing.

Rebates in Algonquin

Algonquin is in ComEd and Nicor Gas territory, so both instant discounts apply. On the ComEd side, a qualifying ducted heat pump earns $900 to $2,000 depending on efficiency tier and heating capacity, and a qualifying ductless or mixed-use system earns $500 or $1,000. On the Nicor Gas side, a 97%+ AFUE furnace earns $225 and a 95% AFUE furnace earns $150, a qualifying 95% AFUE heating boiler earns $350 and a combination boiler earns $500. Add a qualifying smart thermostat on the same invoice and the furnace discount rises by $50; with a ComEd heat pump it adds $75.

Every one of these comes off the invoice at installation. There is no application and no waiting for a check. See ComEd Instant Discounts and Nicor Gas Instant Discounts for the qualifying equipment, or request a free quote with the discounts already applied.

Algonquin HVAC FAQs

Is my furnace old enough to replace?

If it’s original to a house built in the 1990s or early 2000s, it’s at or past the typical 15 to 20 year lifespan. The manufacture date is on the data plate inside the burner door.

Why is my upstairs so much hotter than downstairs?

Usually airflow: undersized returns, leaky ducts or an oversized system that short-cycles. We measure before we recommend equipment.

Do you serve both the McHenry County and Kane County sides of Algonquin?

Yes. The village straddles both counties, and we cover all of it.

Does Algonquin require a permit to replace a furnace or air conditioner?

Yes. The village issues furnace and air conditioner replacement permits, and work can’t start until the permit is issued. We file the permit where the municipality requires one and schedule the inspections as part of the job.

Do ComEd and Nicor Gas discounts apply in Algonquin?

Yes. Algonquin is served by ComEd and Nicor Gas, and both instant discounts come off the invoice at installation: $900 to $2,000 on a qualifying ducted heat pump, $500 or $1,000 on ductless, and $225 or $150 on a qualifying high-efficiency furnace.

What does a repair cost, and is after-hours service more?

Every repair starts with a flat diagnostic fee, then a flat-rate price you approve before work begins, on any brand. After-hours, weekend and holiday calls are priced higher than business-hours calls, and we quote that rate on the phone before we dispatch. Call (847) 224-2420 any hour or book online.

Other Towns We Serve

Don’t see your town? Call (847) 224-2420. View all service areas or the Kane County overview.

Replace Your Boom-Era System and Save

Get a free quote with your Nicor Gas and ComEd instant discounts already applied.

Call (847) 224-2420
Book Online

Planning a replacement? Request a free quote or see financing options.

Discount amounts reflect the 2026 Nicor Gas Energy Efficiency Program for qualifying equipment installed January 1 through December 31, 2026, and are subject to change or cancellation due to funding limits. Rest Assured HVAC LLC is an independent contractor and is not affiliated with or endorsed by Nicor Gas.

Discount amounts reflect the 2026 ComEd Energy Efficiency Program for qualifying equipment and are subject to change or cancellation due to funding limits. Rest Assured HVAC LLC is an independent contractor and is not affiliated with or endorsed by ComEd.