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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.
    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.
    Appreciate the professional service!
    “John from Master Plumbing replaced my water heater after my old one failed. Despite it being after 4 pm, he was able to quickly pick up a replacement unit and install it the same evening, staying late to complete the task. He also went above and beyond to clean up the area around the old water heater, as well as my driveway after some of the water from the old water heater leaked out.”
    Ricky K.
    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.
    Love Master Plumbing and its employees. Sign up for Green Club!
    “Christian was very quick to diagnose the issue, very professional and knowledgeable about what was causing our heating issue. I appreciated the quick and efficient service at a reasonable price! Love Master Plumbing and its employees. Sign up for Green Club!”
    Mercedes T.
    Very happy with my new water heater and installation!!
    “John provided prompt and excellent service as always and I appreciate the follow-up to see if I have any questions. Very happy with my new water heater and installation!! Thanks again to Maddie who is always courteous and great with scheduling!”
    Lisa K.
    I felt every detail was taken care of when they went out the door.
    “Matt and Sean came to do my fall furnace check this afternoon and I want to say I was very pleased. They checked the airflow that I never had done before, cleaned the drain that was covered with corrosion materials, and replaced the humidifier filter with a fresh one I had. I felt every detail was taken care of when they went out the door.”
    Phyliss K.
    I highly recommend!
    “I am happy to share that the team at Master Plumbing, Heating & Cooling responded quickly to repair my furnace. The service technicians (Brett & Jordie) were friendly, informative, and fast. They left the furnace room cleaner than they found it.”
    Donald B.
    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.
    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.