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Verified Reviews for Heating And Air Conditioning Service pros in Illiopolis, IL

*The Angi rating for Heating And Air Conditioning Service companies in Illiopolis, IL is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Heating And Air Conditioning Service needs.

*The HomeAdvisor rating for Heating And Air Conditioning Service companies in Illiopolis, IL is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Heating And Air Conditioning Service needs.

Last update on July 08, 2026

Find Heating and air conditioning pros in Illiopolis

Avatar for MB Heating & Cooling
MB Heating & Cooling
4.6(
26
)
Central A/C - Service or RepairElectric Furnace / Forced Air Heating System - RepairGeothermal Heating or Cooling System - Service+1 more

Serving Illiopolis, IL and surrounding areas

Approved

In business since 1986

Emergency services offered

Credit card accepted

"Curtis installed complete home acand furnace unit ,with all new duct work and did a great job."
Response time4 hrs
Response rate90%
18 neighbors recently requested a quote
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Affordable Home Repair
5.0(
4
)
Thermostat - Install or ReplaceThermostat - Repair or Reprogram

Serving Illiopolis, IL and surrounding areas

Approved

In business since 2020

Free estimates

Emergency services offered

"John and his helper Nathan did an excellent job!! They arrived when they said they were going to an hung a 65 inch tv and a 50 inch tv with no problem at all! The job was done in a timely manor. Both were very professional and friendly! The price was reasonable too!! I would highly recommend and trust the work of Affordable Home Repair for any job! Just an fyi…I told him I would take care of cord hanging down."
Additional Photos
Additional Photos
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Response time2 days
Response rate100%
2 neighbors recently requested a quote
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Avatar for Fix It Right
Fix It Right
New to Angi
Electrical Baseboard or Wall Heater - InstallElectrical Baseboard or Wall Heater - RepairThermostat - Install or Replace

Serving Illiopolis, IL and surrounding areas

Approved

Free estimates

Emergency services offered

Warranties offered

"I'm Jared, a hands-on handyman with a knack for solving problems before they become expensive ones. My business is built on showing up when I say I will, doing the work right the first time, and treating every job like it's my own house. Whether it's a leaky faucet, a wobbly deck, or a full room refresh, I bring the tools, the patience, and the pride to get it done clean.

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Advanced Air Heating & Cooling
5.0(
28
)
Boiler or Radiator Heating System - Install or ReplaceBoiler or Radiator Heating System - Install or Replace - For BusinessBoiler or Radiator Heating System - Repair or Service+47 more

Serving Illiopolis, IL and surrounding areas

In business since 2009

Free estimates

Emergency services offered

"He came out within about 2 hrs of me calling, which was great. He cleaned everything, replace freon, and advised me on how to handle future problems. The best thing was he did not try to sell me a new unit. All of my HVAC equipment in my house is older, and anytime I have had anyone else over for any reason they always try and sell me on new furnace/AC etc. He did not. He was quick and professional and it was appreciated. I will definitely use and recommend him in the future.
"
Recommended by100%of homeowners
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Avatar for Duct Dusters, LLC
Duct Dusters, LLC
4.8(
118
)
Air Ducts & Vents - Clean

Serving Illiopolis, IL and surrounding areas

In business since 2018

Free estimates

Warranties offered

"On April 30, 2025 we utilized the services of Duct Dusters, Springfield, IL to clean our ducts prior to an installation of a new HVAC system. We selected Duct Dusters because they are BBB Accredited, had a 5-Star rating, great reviews, & the owner, Jeff explained their cleaning processes in great detail. Our technicians, Max & Cody arrived on time; were friendly & professional; wore booties over their shoes; showed us before-during-after pictures of each duct; and left the premises tidy & free of debris. They deserve our 5-star rating."
Return air
Return air
North end home
Return air
Return air

+5

Response time6 hrs
Recommended by95%of homeowners
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Heating and Air Conditioning questions, answered by experts

It depends on the type of AC unit and the extent of the mold growth. For example, if you have a small amount of mold in your central air conditioner, it’s worth cleaning it to protect your HVAC system and your health. In situations like these, you can often remove the mold yourself in a couple of hours. On the other hand, if you have a portable AC unit with a severe mold problem, it makes more sense to buy a new one. On average, replacing a portable AC unit costs $100 to $500.

Deciding whether to replace just the AC coil or the entire system depends on the age of your unit and the overall cost. Replacing a coil is less expensive than a full system replacement, but it can still be a pricey repair. If your HVAC system is relatively new and still under warranty, or if the replacement cost is significantly lower than a new system, replacing the coil can be a worthwhile investment that restores efficiency and extends the unit's life. However, for older systems (nearing the end of their 10-15 year lifespan) or those with extensive damage, it is often more cost-effective to replace the entire AC unit. Mismatched coils in an older system can lead to inefficiency and future breakdowns, so a full replacement ensures optimal performance and avoids further costly repairs.

No, a furnace is not the same thing as an AC, or air conditioner, but these are both parts of an HVAC system. They both use air ducts to transport cool or hot air around your home to achieve a comfortable temperature set by your thermostat. An AC runs on electricity, while a furnace can use different fuel sources.

A common HVAC rule is that for every 500 to 600 square feet of living space, you need 1 ton of heating or cooling capacity. Now that you know this common rule, you also need to know that it isn’t very accurate, and a dedicated pro wouldn’t use it for your home. If you talk to a pro who won’t or can’t perform a proper Manual J calculation, consider hiring someone more thorough.

Fixing a leak in an AC unit costs $200 to $1,600, depending on the type of leak and any related damage. But depending on the age and condition of your AC, it might make more sense to replace the AC unit instead of repairing it. If your AC is only a few years old and relatively problem-free, then repairing it is the right call. But if it’s nearing a decade old and has other issues, consider replacing it.

The Illiopolis, IL homeowners’ guide to heating and air conditioning services

From average costs to expert advice, get all the answers you need to get your job done.

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