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TRUSTED BY CORTLAND, IL HOMEOWNERS

  • Average homeowner rating star icon4.7
    Average homeowner rating
  • Verified reviews icon148
    Verified heating and air conditioning services reviews

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

Avatar for Rest Assured HVAC, LLC
Rest Assured HVAC, LLC
4.9(
16
)
Gas Furnace / Forced Air Heating System - InstallCentral A/C - InstallCentral A/C - Service or Repair+11 more

Serving Cortland, IL and surrounding areas

Approved

In business since 2022

Free estimates

Emergency services offered

"When our air-conditioning went out during a stretch of 90 plus degree weather, Jeff answered our call and came out the same day to fix our unit! He also followed up to ensure we were satisfied with his service. We could not be more pleased with his service!"
Amana Gas Furnace
Amana Heat Pump
Response time5 hrs
1 neighbors recently requested a quote
Recommended by50%of homeowners
Avatar for GreenLink Energy Solutions, Inc.
GreenLink Energy Solutions, Inc.
4.7(
60
)
Ductless Mini-split A/C - Install or Replace

Serving Cortland, IL and surrounding areas

Approved

In business since 2011

Free estimates

Warranties offered

"In October of 2024 I had the most excellent good fortune to work with Greenlink Energy Solutions as part of an ComEd Home Energy Efficiency project that included replacement of the furnace/a.c. and water heater, as well as top to bottom weatherization of my house. Even before the project started both Olivia and Jarron took the time to answer any questions and address any concerns I had regarding the equipment being installed and the overall scope of the project. Day 1, first up was a couple of electrical guys, quickly followed by Jarron and his HVAC team, Ben & Ryan. All on time and ready to get to it. Professional, pleasant and remarkably tolerant of my nonstop questions about the systems, the guys went to work and, other than a quick lunch break, worked nonstop, not particularly concerned about the clock but more about getting to a reasonable stopping place for the day. By the time they were finished, everything was operational, square and plumb, all pipes, valves, duct work and conduit looking very slick, orderly and professional. (5 stars just on the sheet metal work alone). Next up was the weatherization team with Nick leading the charge. Again, on time and ready to go. These guys, Zarek, Steven and Danial, came in with a plan and went right two it, peeling off to address varying issues and again, once on the ground it was go time for these guys. Remarkably, all willing and ready to jump in to even the less desirable parts of the project (like who really wants to go into a hot attic and crawl around in the corners? But they did it and with no hesitation or whining). Over all there were several things that impressed me about the Greenlink teams. There is the obvious stuff, like the punctuality and, remarkably, the through cleanup at the end of each day, and also the obvious work ethic, mutual respect amongst the team members and easy and informative communication with me. I think what was the most reassuring though, you could see the obvious pride the Greenlink people take in their work and, just as importantly, the obvious pride they take in working as part of the Greenlink team. That says a lot. I would not hesitate to recommend Greenlink Energy Solutions to anyone. I suspect my neighbors are already tired of hearing about how good they are."
Infrared Light Switch
Combustion Test
Water Heater Combustion Test
Cellulose Insulation Installation
Air Sealing Can Lights

+12

Response time1 day
4 neighbors recently requested a quote
Recommended by94%of homeowners
Avatar for Improved Comfort Heating & Air Conditioning
Improved Comfort Heating & Air Conditioning
5.0(
9
)
Central A/C - InstallGas Furnace / Forced Air Heating System - InstallElectric Furnace / Forced Air Heating System - Install+1 more

Serving Cortland, IL and surrounding areas

Approved

In business since 2021

Free estimates

Warranties offered

"Angel and Tyler worked their butts off to help us with our air conditioning. They unfortunately had to do way more work than expected, however they were at our house late and always stayed in communication on what was going on. They did a great job and were very detailed and thorough with all testing making sure that the job was done right and there were no issues. We had a great experience!"
Boiler Replacement
Response time9 hrs
Response rate87%
24 neighbors recently requested a quote
North South Heating and Cooling
New to Angi
Central A/C - InstallGas Furnace / Forced Air Heating System - InstallCentral A/C - Service or Repair+15 more

Serving Cortland, IL and surrounding areas

Approved

Free estimates

Small jobs welcome

Credit card accepted

We are a locally owned and operated company that values honesty and integrity and treats your home as if it were our own. We offer a variety of General Contractor services that are customizable to each individual project. You will find us to be competitively priced, paying close attention to the details of each and every project that we are involved with. We look forward to building lasting relationships and guarantee your satisfaction!\n

5 neighbors recently requested a quote
Zorana
New to Angi
Air Ducts & Vents - Clean

Serving Cortland, IL and surrounding areas

Approved

Emergency services offered

Small jobs welcome

Offers commercial services

I’m a reliable and detail-oriented house cleaner with 3 years of hands-on experience providing high-quality cleaning services. I’ve worked in a variety of homes, handling everything from routine maintenance cleanings to deep cleans, move-in/move-out jobs, and organizing spaces to leave homes spotless and refreshed. I service Chicago north-western suburbs and nearby communities. I’m flexible and willing to travel to meet clients’ needs.\n\nMy skills include thorough kitchen and bathroom cleaning, dusting, vacuuming, mopping, deep cleaning, and paying close attention to detail in every space I work in. I take pride in being efficient, trustworthy, and respectful of each home.\n\nI focus on delivering consistent, high-quality results and making sure every client is satisfied. If you’re looking for someone dependable who will treat your home with care and leave it looking its best, I’m ready to help.

Avatar for Valor Facility Solutions LLC
Valor Facility Solutions LLC
New to Angi
Air Ducts & Vents - Clean

Serving Cortland, IL and surrounding areas

Approved

Free estimates

Emergency services offered

Warranties offered

Welcome to Valor Facility Solutions LLC!\n\nWe are a veteran-owned, family-operated commercial cleaning and facility solutions company proudly serving Chicago, Northwest Indiana, and surrounding communities.\n\nAt Valor, we understand that a clean, professional environment matters. Our mission is to provide dependable, high-quality cleaning services with the same values we believe in—integrity, discipline, attention to detail, and exceptional service.\n\nWhether you need recurring office cleaning, facility maintenance, move-in/move-out cleaning, or customized janitorial services, we’re ready to earn your business.\n\nWhen you choose Valor Facility Solutions, you’re choosing a local company that takes pride in showing up, doing the job right, and building long-term relationships with our customers.\n\nProfessional Service. Military Precision. A Standard You Can Trust.\n\n— Temiaka & Tonya Sanchez\nOwners, Valor Facility Solutions LLC

Residential Deep Cleaning
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Heating and Air Conditioning FAQs, answered by experts

Vents may blow air even though the air conditioning system is off because of the pressure difference between indoor and outdoor air or drafts from leaky ducts. Check for leaks or drafts in the ductwork or around windows and doors.

Whether an HVAC damper should be open or closed depends on the season, the zone it controls, and the temperature in that zone. In the summer, open upstairs dampers and close lower-level dampers to get the most efficient cooling possible. In the winter, do the opposite. Cool air will naturally flow down to lower levels, while warm air will rise. This keeps your system from working harder and helps prevent common AC problems.

Dirty filters are almost always the cause of poor airflow, so they should be regularly cleaned and then replaced as needed. The fan blades can also get dirty, so they should be cleaned when the unit is turned off. Make sure that the outdoor area around the back of the unit is unobstructed. Trees, shrubs, trash, and other objects could be too close to your unit.

No, it's not advisable to only replace the outside AC unit connected to your system. AC units are designed to work as a cohesive system, and older units work differently than newer units. Therefore, replacing only one component can lead to incompatibilities that affect the system’s performance. Replacing one component can void your warranty, costing you money for repairs.

Yes, you should turn off your AC if it’s leaking. Turning off the system prevents more condensation from leaking and reduces strain on the unit if a damaged internal component or lack of refrigerant is the cause. While this may temporarily stop the leak, water can continue to drip from a thawing coil even after the system is off. As soon as you notice a leak, turn off the unit and investigate the source or call a professional for an inspection.

The Cortland, 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.