How do I know if my AC capacitor is failing?

• <div><p>When the capacitor fails, the AC unit can’t operate at all. The most common sign is the thermostat forcing the blower to turn on, but it only circulates room-temperature air. The AC unit also won’t make any noise or indication that it’s on. Sometimes, the compressor might hum as it attempts to work, but without any results.</p><p>Before a full shutdown, a faulty capacitor can cause your AC to struggle while turning on. The unit might also shut down in the middle of a cooling cycle. </p></div>

What is the most common rule used for HVAC load calculation?

• <div><p>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.</p></div>

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*The Angi rating for Heating And Air Conditioning Service companies in Canton, 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 Canton, 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 November 11, 2025

Reviewed in November 2015
I have been having huge heating bills and during investigations discovered a hole in the wall in the crawlspace that the original insulation contractor had covered with cardboard and spray foamed. End result - massive air leak under the cardboard. I called Kaufman & Sons and Cliff came out...
Clifford Kaufman & Sons Inc
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Reviewed in November 2015
I hired a man to look at my heating system if it don't work I'm looking at a sear modification
Sears Roofing
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Reviewed in January 2015
Very good service. Mark was knowledgeable and helped us figure out what we needed to heat and cool our new home. He also recommended insulation for our basement. They came out the day after we closed and were the first of our contractors done with our home improvement projects.
Meister Heating & Air Conditioning
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Reviewed in December 2012
After extremely frustrating telephone encounters with other potential handymen, I contacted Scott Siegrist of Home Sweet Home. We had recently moved into our new house and had had new wood flooring put in. Unfortunately there was a large gap left between the new floor and the base molding in...
Home Sweet Home Handy Man
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Reviewed in August 2012
We noticed a leak from the bottom of the hot water heater and some rusty water flowing out. We called Carl's in the morning and he got someone out right away. He immediately recognized that the bottom was rusting out and that the heater had to be replaced. He thought it was out of warranty, but...
Carl's Plumbing Services Inc
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Reviewed in August 2012
Todd and helper suggested how best to rebuild our deck after removing the old deck including substructure. Arrived as scheduled and completed a quality job in less than ideal winter working conditions. Returned in April when requested to make some minor adjustments.
HUBER BROTHERS CORP
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Reviewed in May 2012
We relocated from out of state. We purchased the home and required home inspection. The inspector theoretically evaluated all electrical systems and the HVAC system. Inspector did not pick up the following:1. Poor condition of the septic sewer ejection system. Ejector pit needs major...
Dream Home Inspections
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Reviewed in May 2012
We contacted Feldco on the internet. They called the very next day and set up a date and time for the salesman to come out. The salesman was very honest with us and even told us we could get windows cheaper however the quality would not be there. We loved all the features of these windows and...
Feldco Windows Siding & Doors
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Reviewed in August 2011
Technician was prompt and communicated the status of everything to me and my wife very well. I do have one small complaint. At the time of service, my wife was unable to get the Angie's list coupon to print. They would not accept a snapshot from the screen. Also, I submitted a question to...
Raleigh Heating & Air
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Reviewed in August 2010
My car broke down and it would not start. It is blazing hot today and miserable in the car without air. I had just got off work and left the parking lot, when my car just died. I was stuck. Right in traffic. Some young guys helped me push it off to the side and I called my husband. He told me to...
County Wide Towing
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Find Heating and air conditioning pros in Canton

Walker N Sons Construction

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Walker N Sons Construction

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residential general contractor

Perez construction

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Perez construction

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Hello this is eduardo Perez I'm here looking for people who need help with roofing and siding and concrete we are very professional and we will live to help you call 3093636098

Brandon

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Brandon

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18 years of experience

By hiring me as your handyman, you are choosing a reliable and skilled professional who will provide exceptional service, thorough communication, attention to detail, effective problem-solving, and a commitment to your overall satisfaction. I am confident that I am the right person for the job and look forward to exceeding your expectations.

Non-Typical Heating And Cooling

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Non-Typical Heating And Cooling

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heating and cooling

Percolation Consulting, LLC

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Percolation Consulting, LLC

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Integrated solar energy solutions: photovoltaic, solar-thermal, battery storage and heat pumps. We are not tied to any specific PV manufacturer and will source the best solution for your location and situation. Solar energy is no longer idealists' domain - it makes solid financial sense. Whether your goal is to minimize the time until your solar installation is paid off, or you want to ride out the Zombie apocalypse in comfortable energy self-sufficiency, we have the perfect solution for your location and building use. Contrary to popular perception, year-round self-sufficiency can be reasonably achieved in the Midwest. We have close relationships to vendors of weekly and seasonal energy storage systems which will keep lights and heat on year-round.

Hiatt Repair and Maintenance

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Hiatt Repair and Maintenance

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We are a family owned property maintenance and repair company that specializes in customer satisfaction, residential or commercial.

Deputy DUCT

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Deputy DUCT

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Deputy Duct is the leading Air Duct Cleaning Service in the greater Peoria and Bloomington area. We serve all counties in central Illinois. We offer air duct cleaning, dryer vent cleaning, filter replacement, video inspection, air duct deodorizing and sanitation. For all your air duct cleaning needs, call the best in the Peoria area.

Clean Haven Solutions

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Clean Haven Solutions

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Handyman Electrical Plumbing Lawn & Yard Work Furniture Assembly TV Wall Mounting Residential Cleaning Business Cleaning Window Cleaning Move in/out Cleaning Heating & Air Conditioning Owner Operated with 20+ Years Experience. Providing Residential/Commercial Maintenance Services.

Duct Dusters LLC

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Duct Dusters LLC

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7 years of experience

We are a small family owned Business. Who provides big service. We specialize in Air duct and dryer vent cleaning.

M & M Mechanical

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M & M Mechanical

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M & M Mechanical Lincoln, IL, 62656 (217) 870-0211 At M & M Mechanical your satisfaction is our goal, we provide quality air conditioning and heating services, serving people in Lincoln IL and surrounding cities. Please call us today! Heating Systems, Steam Boilers, Boilers, Furnaces, Cooling Systems, Humidifiers, Dehumidifiers, Electrical Systems, Water Wells Bell IL; Evans IL; Lawndale IL; Burton View IL; Chestervale IL HVAC Repair, HVAC System, HVAC Contractors, AC Maintenance, AC Installation http://mandmmechanicalil.com/

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Heating and Air Conditioning questions, answered by experts

The difference between a home surge protector and an HVAC surge protector is that an HVAC surge protector is designed to protect the components inside your HVAC unit while a home surge protector is installed near appliances and meant to protect your entire home. There are three tiers of whole-house surge protectors, and they are more expensive to install than HVAC surge protectors.

A new HVAC system combines components to control indoor temperature and air quality. Features include a furnace or heat pump and an air conditioner or evaporator coil, depending on the climate requirements. It also involves a network of ductwork for air distribution, a thermostat for temperature regulation, and electrical connections. Air purifiers or humidifiers can be integrated to improve indoor air quality.

One of the fastest ways to unfreeze an AC unit is to turn off the unit and, if it’s warm outside, use the fan-only mode to help blow warmer air through the unit to speed up the defrosting process. While it may be tempting to use a hair dryer to defrost the air conditioner, that high heat can damage the coils.

After defrosting, if you can safely solve the issue with a fix like changing the filter, go ahead and do so. Otherwise, call in a pro before turning your AC back on.

When the capacitor fails, the AC unit can’t operate at all. The most common sign is the thermostat forcing the blower to turn on, but it only circulates room-temperature air. The AC unit also won’t make any noise or indication that it’s on. Sometimes, the compressor might hum as it attempts to work, but without any results.

Before a full shutdown, a faulty capacitor can cause your AC to struggle while turning on. The unit might also shut down in the middle of a cooling cycle.

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.

The Canton, 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.

See all articles

Alison Kasch
•
Oct 22, 2025Oct 22, 2025
How Much Does a Heat Pump Cost? [2025 Data]
A heat pump is an eco-friendly heating and cooling system that can save you money on utilities each month. Find out the cost of a heat pump with this guide.
Paige Bennett
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Oct 20, 2025Oct 20, 2025
How Much Does AC Drip Pan Replacement Cost? [2025 Data]
Faulty AC drip pans can lead to pesky leaks and improper home cooling. Find out how much AC drip pan replacement costs for your cooling system.
Gemma Johnstone
•
Oct 20, 2025Oct 20, 2025
How Much Does It Cost to Check Air Ducts for Leaks? [2025 Data]
Your leaky ductwork may be hiking up your energy bills. We explore the cost of checking air ducts for leaks, which may be worth it for your home.
Angi
•
Nov 6, 2025Nov 6, 2025
How Much Does Wall Heater Installation Cost? [2025 Data]
Discover the average wall heater installation cost, key price factors, and expert tips to help you budget and save on your next home heating project.
Taylor Freitas
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Oct 20, 2025Oct 20, 2025
What Is HVAC? Learn About the Main Components, Types of HVAC Systems, and More
What is HVAC? Learn how your home’s heating, ventilation, and air conditioning system works to regulate your home’s temperature, humidity, and quality.
Paige Bennett
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Oct 20, 2025Oct 20, 2025
What Is a Heat Recovery Ventilator (HRV) System and What Does It Do?
Ventilation systems (like HRV and ERV systems) keep fresh air circulating throughout newly-built homes—but what is an HRV system exactly? Find out here.