Top
24 Hour Emergency Repair Available! Is TODAY Soon Enough?
Smart Financing Made Easy
Get the updates you need now and pay over time with multiple lender options through Optimus. Quick approvals, simple terms, and solutions that fit your budget.
Master Plumbing, Heating & Air Master Plumbing, Heating & Air
$50 OFF Water Heater Repair

Exclusions may apply.

Valid Dec 1, 2025 - Nov 30, 2026

24-Hour Air Conditioning Services in Mt. Vernon

For top-quality air conditioning repair and replacement in Linn, Johnson, Jones, Cedar & Benton County, choose Master Plumbing, Heating & Cooling.

We know a broken AC isn’t an actual emergency—but it sure feels like it if yours stops working in the middle of July! That’s why we offer 24-hour air conditioner repair with fast response times everywhere in Mt. Vernon, IA, and the surrounding areas. You can count on our team at Master Plumbing, Heating, & Cooling for all your heating and cooling needs.

Since 1986, we’ve gone above and beyond to offer nothing less than the best air conditioning services possible at the best possible rates. Our HVAC contractors have the experience and tools to install, replace, repair, and maintain cooling systems of all types and brands.

If you’re having a problem with your air conditioner, Contact Us today. We’re available 24/7, including holidays!

Preventative AC Maintenance

Regular maintenance is key to ensuring your air conditioning system operates smoothly and efficiently year-round. Our preventative maintenance program includes seasonal tune-ups, safety checks, and system adjustments to keep your AC running at its best.

By catching minor issues early, our maintenance services can extend the lifespan of your AC unit, improve indoor air quality, and help you avoid costly breakdowns during the hottest months.

Energy-Efficient AC Solutions

When it’s time to replace your aging air conditioning system, we offer a wide range of energy-efficient models to suit your home’s needs. Our Lennox-certified technicians will help you select the perfect unit based on your square footage, cooling requirements, and budget.

Upgrading to a high-efficiency AC can significantly reduce your energy costs and environmental impact. We’ll ensure your new system is properly sized and installed for maximum performance and energy savings.

Looking for top-quality air conditioning services? Call Master Plumbing, Heating, & Cooling at (319) 214-5064 to work with Mt. Vernon, IA's most trusted air conditioning company.

  • Respectful & Tidy

    Our pros treat your home like their own, wearing shoe covers and leaving every work area spotless.

  • Award-Winning Service

    Recognized 5 times by Angie's List for outstanding service, we go above and beyond to deliver exceptional results every time.

  • Transparent, Upfront Pricing

    No surprises, no hourly tricks. You’ll know the cost before we start, so you can make confident decisions.

  • Fast, Same-Day Solutions

    Plumbing and HVAC issues can’t wait. We get you back on track quickly with prompt, same-day service.

Decades of Service, Thousands of Smiles

Hear from the homeowners and businesses who rely on us for expert solutions.
    Would definitely recommend him and Master Plumbing.
    “John came out to do my annual plumbing inspection; caught and fixed a few things (had pictures of discrepancies), cleaned out my tankless hot water heater at no charge.”
    Eric F.
    Would highly recommend!
    “Bill M was my service technician. Very thorough and explained everything so I understood. Gave tips on future maintenance and did a great job of getting the new water heater installed and the old removed in a very timely manner as well as any cleanup.”
    Becky W.
    I would definitely call them again!
    “Had John & Henry from Master Plumbing & Heating here, say before Thanksgiving to replace my water heater. They did a fantastic job and had it installed and running in 4-5 hrs. Both were very professional and cleaned up after themselves, as well as took the bad heater with them.”
    Karen R.
    Very personable and I highly recommend him for any plumbing needs you may have.
    “Great experience with John. He is very knowledgeable and gets the work completed in a timely manner. He discussed everything he would be doing beforehand and told us the cost. When he was done, there was no up charging. The cost was exactly what he said it would be.”
    Elizabeth D.
    I would shout from the mountaintop my 100% recommendation for Master Plumbing!
    “John was amazing!! He was courteous, kind, prompt, respectful and very knowledgeable! If I could give him 10 stars or more, I definitely would!! He took care of our "emergency" , took time to explain everything to us and even confirmed for us and appliance maintenance provider to contact. I would shout from the mountaintop my 100% recommendation for Master Plumbing and definitely for John!!”
    Sue P.
    I will definitely recommend this company!
    “We had a water softener installed. I called Master Plumbing, Heating, and Cooling at about 8AM and we had a water softener installed by 12:15. Bill was our service technician. He was so very polite and respectful of our home! ( He wore shoe coverings) Bill explained everything extremely well. We bought their Green Club Membership, for a few dollars more, which will cover plumbing, heating, and cooling. Our systems are well over 25 years old, so over the long run this membership will save us a lot, Thank you Bill and Master Plumbing, Heating & Cooling.”
    Diana P.
    10/10 recommend this place!
    “Bill was outstanding! Very fast, no frills or upsells 10/10 recommend this place! Join the membership too- pays for itself in one visit!”
    Shawn G.
    We feel confident with this team to help us!
    “We had a problem with our HVAC system leaking from the condensate and the blower and Matthew E was the best person for the job! He was professional, quick, and helped us understand what went wrong and got the items replaced in no time! We signed up for the Green Club for regular maintnence.”
    Kendal A.
    Bill was outstanding, friendly, and very accommodating!
    “Bill came to our home to do a full plumbing inspection. Bill was very thorough and showed attention to detail. We noted to technician that we had a concern with our shower drain. Bill was right on it! He recommended we consider using a snake on the drain. Bill adjust the price based on the fact that it was an easy job to complete. He also tested our water and reviewed the report with us. Bill was outstanding, friendly, and very accommodating!”
    Tana L.