What Customers Are Saying About Collins

★★★★★ 4.8 out of 5 · 112 Google Reviews · Serving NW Indiana since 2005
4.8
★★★★★
112 Google reviews · March 2026

Second Opinion Stories

Collins regularly gets calls from homeowners who got a quote elsewhere that didn't sit right. More often than not, there's a reason.

★★★★★

"I can’t say enough good things about Collins Heating & Cooling! Our furnace went out, and after getting a sky-high repair quote from another company, we decided to call Collins for a second opinion. Mark came out, quickly diagnosed the real problem, and fixed it for a fraction of the first quote. We felt so informed and taken care of."

D.
Furnace Repair 📄 Google
★★★★★

"I called out a company (who will remain nameless) for a furnace cleaning. From the moment the technician opened the furnace door he was painting a picture of gloom and doom. I called Collins for a second opinion. Mark thoroughly inspected the furnace and assured me it was in fine working order. He saved me thousands of dollars."

Rick Kellemen
Furnace Repair 📄 Google
★★★★★

"Collins performed like a 5-star company, and this is very hard to find. They surpassed all of the wonderful reviews we have read about Collins. After a speedy repair by Collins, our older furnace is operating perfectly when other companies said we needed a new one."

Jaclyn Blitzstein
Furnace Repair 📄 Google
★★★★★

"Called Collins for an estimate for a new AC unit because another company said I needed a new one. Their cheapest was $4,600. When he arrived he asked if he could look at it first — he was able to fix it for $275. Collins is the only HVAC people I will ever use. Definitely trustworthy."

Cesar Jauregui
AC Repair 📱 Facebook

Honest Pricing & No Upsells

You know the price before any work starts. And you’ll never hear a pitch for something you don’t need.

★★★★★

"Our AC broke down during the last heat wave, and we got scheduled to come out right away to check. Mark is super transparent, and he will tell you what he’s going to do and what it will cost before he does it."

Mario Torres
AC Repair 📄 Google
★★★★★

"Mark was fantastic! He responded right away. He did a very thorough exam of both our AC unit and furnace and explained things very clearly. He never tried to upsell us or give us more than we need. Highly recommend!!"

Joan Denny
AC & Furnace 📄 Google
★★★★★

"Our air conditioner just stopped working one day. We called and they were able to come by a couple hours after the call was made. Mark was professional, quick, did not try to upsell, and charged us a fair price. Highly recommend."

Miranda Bowen
AC Repair 📄 Google

AC Repair

What to expect when you call Collins about a broken air conditioner.

★★★★★

"This SAME DAY service I received from Mark was literally THE best service I ever received in my lifetime from any service provider, PERIOD! This man is honest, knowledgeable, kind and extremely reasonable. Please don’t waste time searching anywhere else."

Farooq Nasser
AC Repair 📄 Google
★★★★★

"We called Collins and Mark was able to come out the same day. He was very professional and took care of our AC problem the same day. He even agreed to come back and check our unit before Fall arrives."

Miguel Sendejas
AC Repair 📄 Google
★★★★★

"I called Mark on a Saturday, left a message and he called me back within a half hour and made it out within 2 hours to fix our AC unit! Mark is extremely professional, friendly, and runs his business phenomenally!"

Jessica Thomas
AC Repair 📄 Google

Furnace & Heating Repair

When the heat stops working in a NW Indiana winter, these homeowners called Collins.

★★★★★

"I called Mark on a Sunday and he answered the phone. This is almost unheard of now because all the companies want you to leave a message. Mark was able to fix my furnace the same day and he had the part on his truck."

Ms. Lowe
Furnace Repair 📄 Google
★★★★★

"My heat went out and from the reviews and being a local business I called Collins Heating and Air. Mark was able to come that day. He got the part and was here first thing the next day to install. He was informative and nice. I would definitely use Collins again."

Tracy Clark
Furnace Repair 📄 Google
★★★★★

"We were referred to Mark by my dad who raved about him; and he was right! Mark was able to come to our home to check out our furnace within a day of my initial phone call — much faster than any other company I contacted."

Aimee Moran
Furnace Repair 📄 Google

Furnace & AC Installation

What homeowners experience when they choose Collins for a new system.

★★★★★

"Came out the same day I called. Within 48 hours I had a brand new furnace. You can’t beat the price, quality, or the service."

Jonathan Lee
Furnace Installation 📄 Google
★★★★★

"Mark came out very promptly to give us an estimate. He was very professional and took his time explaining everything to us. He was also very patient with all of my questions, and answered them all. His price was the best of the three estimates we received."

Debbie Jones
Furnace Installation 📄 Google
★★★★★

"A+++ We are so happy with Mark and Collins Heating & Cooling. Great service. Very professional. Honest. Great pricing. Arrived on time for every call. Mark was actually the one doing all the work himself. He made sure everything was done right."

Cindy R.
HVAC Installation 📄 Google
★★★★★

"I’d give Mark 10 stars if I could. Came right over after our induction blower went out, diagnosed the problem same day, presented options, ordered new furnace next day; came over for the removal, new furnace 2 days later; took care of permit, too. Very happy — highly recommended."

David Parker
Furnace Installation 📱 Facebook

Local, Personal, Trustworthy

What keeps NW Indiana homeowners coming back — and referring their neighbors.

★★★★★

"You have questions, he has answers. The best of the best, truly cares for his customers. You are more than just a dollar sign to Collins. This is the rare, personal company that you can no longer find."

Terry Noort
General 📄 Google
★★★★★

"As a new homeowner, I’ve encountered a couple of issues over the past few months, and I sincerely don’t know what I would have done without him. He not only fixes the immediate problem, but educates you on how to prevent future issues. Mark is the only HVAC person I’ll ever use."

Kevin Sheehan
General 📄 Google
★★★★★

"Mark is the hardest worker I have ever had in my home. He offers more than fair prices, does a phenomenal job, answers all your questions, cares about your safety and comfort. He is a straight shooter and his word is gold. Call him. You will be glad you did."

Demetra Funderlic
General 📱 Facebook
★★★★★

"Mark is a stand-up guy. Honesty and dependability are a lost service, but Mark lives by this creed. Feel self-assured that when he is on the job it will be done in a top-of-the-line manner and he makes you feel like you are the most important job he has that day."

Kevin Kessler
General 📱 Facebook

Had a Good Experience?

If Collins serviced your system and the work was solid, a Google review helps other NW Indiana homeowners make a confident decision. It takes about two minutes.

Leave a Review on Google

Ready to Schedule Service?

Serving Highland, Munster, Griffith, Schererville, Dyer, St. John, and Hammond since 2005.

Call Us Directly
(219) 924-7423

A real person answers. Mon–Fri 8–5, Sat 8–Noon.

OR
Send a Message

We’ll follow up to confirm your appointment.

"*" indicates required fields

Name*
Zip*
This field is for validation purposes and should be left unchanged.