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TRUSTED BY KNOX, IN HOMEOWNERS

  • Average homeowner rating star icon4.9
    Average homeowner rating
  • Verified reviews icon15
    Verified heating and air conditioning services reviews

Top-Rated Heating and air conditioning pros in Knox - Updated Nov 2026

Avatar for SAS Heating & A/C Service
SAS Heating & A/C Service
4.6(
75
)
Central A/C - Service or RepairCentral Air Cleaner - Repair or ServiceGas Furnace / Forced Air Heating System - Repair+3 more

Serving Knox, IN and surrounding areas

Approved

In business since 2012

Free estimates

Emergency services offered

"He installed a digital thermostat for our very old gas furnace and AC. Although the furnace was very old, we wanted to keep it since we were about to sell the house. He agreed with our decision and he even help us on an unrelated home improvement project before he left!"
Work
Work
Work
Response time3 hrs
Recommended by97%of homeowners
Avatar for Regional Plumbing Heating & Air
Regional Plumbing Heating & Air
5.0(
15
)
Central A/C - InstallGas Furnace / Forced Air Heating System - InstallCentral A/C - Service or Repair+47 more

Serving Knox, IN and surrounding areas

Approved

In business since 2001

Free estimates

Emergency services offered

We are family owned and operated. We service all brands, makes and models. From furnace and water heater repair and replacements, all the way to a leaking kitchen faucet or bathroom toilet. One call REALLY does it all. Faucets, toilets, sinks, drain rodding, water heaters, boilers, furnaces, air conditioners and humidifiers. New construction to radiant heat. You know you called the pros the first time. Licensed, bonded and insured, we offer easy approval and affordable financing as well!

18 neighbors recently requested a quote
Recommended by100%of homeowners
Avatar for Geothermal Specialist, Inc.
Geothermal Specialist, Inc.
4.5(
35
)
Geothermal Heating or Cooling System - InstallGeothermal Heating or Cooling System - Service

Serving Knox, IN and surrounding areas

Approved

In business since 1983

Warranties offered

Credit card accepted

"This is hard to believe but the HVAC guy that installed the GeoThermal refused to repair it because it was 4 years old. I found Geothermal Specialist through HomeAdvisor, these people got on the repair in less than 24 hours after my call, but also showed me that the Modine Geothermal has a 10 year parts and labor warranty."
Response time2 hrs
Response rate87%
5 neighbors recently requested a quote
PD Duct Cleaning LLC
4.9(
9
)
Air Ducts & Vents - Clean

Serving Knox, IN and surrounding areas

Approved

In business since 2019

Free estimates

Credit card accepted

We are committed to excellence in every aspect of our business. We uphold a standard of integrity bound by fairness, honesty and personal responsibility. Our distinction is the quality of service we bring to our customers. Accurate knowledge of our trade, combined with ability, is what makes us true professionals. Above all, we are watchful of our customers' interests and make their concerns the basis of our business. Call us today!

Recommended by66%of homeowners
Avatar for PD Duct Cleaning LLC
PD Duct Cleaning LLC
4.9(
9
)
Air Ducts & Vents - Clean

Serving Knox, IN and surrounding areas

Approved

Super Service Award Winner

In business since 2019

Free estimates

Credit card accepted

We are committed to excellence in every aspect of our business. We uphold a standard of integrity bound by fairness, honesty and personal responsibility. Our distinction is the quality of service we bring to our customers. Accurate knowledge of our trade, combined with ability, is what makes us true professionals. Above all, we are watchful of our customers' interests and make their concerns the basis of our business. Call us today!

Response time7 hrs
Response rate91%
24 neighbors recently requested a quote
Avatar for David Solutions LLC
David Solutions LLC
5.0(
2
)
Central A/C - InstallDuctless Mini-split Heating System - Install or ReplaceDucts & Vents - Install or Replace+3 more

Serving Knox, IN and surrounding areas

Approved

In business since 2024

Free estimates

Credit card accepted

We take great pride in our experience, expertise, quality and customer service, that we provide to meet the consumer's needs. It is our mission to provide excellent workmanship, and complete customer satisfaction, from start to completion of a project. In order to understand the needs and expectations of our customers, we take great care to work and communicate, with every customer in a professional manner. Our reputation is based on service, safety and quality, regardless of how large, or small the job. Call us today!

Response time4 hrs
Response rate95%
Avatar for Michiana Duct Cleaning
Michiana Duct Cleaning
5.0(
1
)
Air Ducts & Vents - Clean

Serving Knox, IN and surrounding areas

Approved

In business since 2004

Free estimates

Credit card accepted

Established in 2004, Michiana Duct Cleaning started with 1 owner and 1 truck, since we have expanded to 3 trucks and have become a family, veteran owned and operated local business. Marc and Nick (father and son duo) take pride in offering services that go beyond removing dust and debris. The services we offer help improve your quality of life inside your home. Our team utilizes state of the art equipment and techniques to thoroughly clean your air ducts and dryer vents, ensuring optimal performance and reducing the potential of fire hazards. Give us a call today to schedule your inspection and cleaning.

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Recommended by100%of homeowners
Tough touch cleaning
New to Angi
Air Ducts & Vents - Clean

Serving Knox, IN and surrounding areas

Approved

Free estimates

Emergency services offered

Small jobs welcome

Here's your letter, ready to post:\n\n---\n\n**Professional Cleaning Services — Commercial & Residential**\n\nHello,\n\nI'm Chantana, and I've been providing professional cleaning services for over 15 years. If you need a cleaner you can count on, I'd love to earn your business.\n\n**Services include:**\n- Regular residential cleaning (weekly, bi-weekly, monthly)\n- Deep cleans\n- Move-in / move-out cleaning\n- Office and commercial space cleaning\n\nI'm dependable, thorough, and I treat every home and business like it's my own. Fair pricing, flexible scheduling, and free estimates.\n\n**Call or text me anytime: 5747425998**\n\nThank you for considering me — I look forward to working with you.

Avatar for Iron Route Transport LLC
Iron Route Transport LLC
New to Angi
Air Ducts & Vents - Clean

Serving Knox, IN and surrounding areas

Approved

Free estimates

Emergency services offered

Small jobs welcome

Iron Route Transport LLC – Junk Removal & Cleanouts 🚛\nWe are a local, family-owned business based in Lake County, Indiana, providing reliable junk removal, cleanouts, and light hauling services. We take pride in being dependable, respectful, and getting every job done right the first time. We treat people how we want to be treated.\n\nWe service Lake County and surrounding areas including Hammond, Gary, Merrillville, Crown Point, and the Chicagoland area, and we travel for the right job.\n\nWe specialize in garage cleanouts, home cleanouts, junk removal, and small hauling jobs. We are known for fast response times, fair pricing, and clean, efficient work.\n\nWhen you hire us, you get clear communication, on-time service, and respect for your property. Our goal is to make your life easier and get the job done right.\nSame-day and next-day availability. Message for a quote.

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Heating and Air Conditioning FAQs, answered by experts

No, you should not attempt to replace an AC evaporator coil yourself. This is a complex task that must be performed by a licensed HVAC technician. The process involves handling hazardous and flammable refrigerants, which poses significant safety risks. Attempting a DIY replacement can also cause further damage to your HVAC system and will likely void its warranty. It is necessary to hire a local AC repair professional for this job.

There are several tell-tale signs that your AC coils need cleaning, including:

  • You’re getting higher electricity bills.

  • Your home doesn’t feel as cool as it usually does.

  • Your AC unit is running longer than usual to cool your home.

  • Your home is more humid than usual.

  • The coil is covered in frost while running.

A calculation method that your HVAC contractor will use to ensure your system does what it's supposed to is measuring duct output, or its CFM. The calculation requires knowing the cross-sectional area of the ductwork and determining the air speed past any given point within it.

There are two main reasons your furnace and AC are turning on at the same time. The first could be that you’re confusing the furnace with the blower. The blower is located in the furnace and will turn on to distribute cool air from the air conditioner through the ductwork in the home. This is normal. If the actual furnace is turning on at the same time as the AC and hot and cool air are coming into the home, it could be a result of incorrect writing to a new thermostat or new systems.

Some HVAC systems tend to use R410A refrigerant, although if you have an older model it may be using R22. R22 is banned due to its harmful environmental and health impacts, and it is a sign that your AC unit is old enough to consider a replacement and the significant efficiency gains that could come with it.

The Knox, IN 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.