Air Conditioner Repair and Replacement to Keep Your Home Cool in Humid Minnesota Summers

NMS Mechanical provides dependable air conditioner repair and replacement in Lakeville, MN, and across the Twin Cities Metro and surrounding areas. When your AC quits during a heat wave, our skilled team works to find the problem, explain your options plainly, and restore comfortable temperatures in every room. Call (952) 451-8923 to schedule AC service and cool your home back down.

Signs Your Air Conditioner Is Struggling Before the Heat Wave Arrives

A cooling system rarely fails without warning. Watch for these symptoms:

Weak Airflow

The vents push out less air than they used to.

Warm Air From the Vents

The system runs, but the house never cools off.

Strange Noises or Smells

Grinding, buzzing, squealing, or musty odors from the unit.

Ice or Water Leaks

Frost on the lines or puddles around the indoor unit.

High Cooling Bills

Electric costs climb while your habits stay the same.

An Aging System

Your air conditioner has been running for well over a decade.

Spotting these early can mean a smaller repair and a more comfortable summer.

Central Air Repair Done Right on All Makes and Models

We work on every brand of air conditioner, not just the ones we sell. Our technicians are experienced troubleshooters who pinpoint the cause quickly, so you only pay for the work your system actually needs. Common repairs include:


  • Full system diagnostics to find the real source of the problem
  • Cooling and airflow issues that leave rooms warm and stuffy
  • Electrical and control repairs that keep the unit from starting or staying on
  • Thermostat problems that cause uneven or unreliable temperatures
  • Frozen coil and drain issues that lead to ice buildup or water damage
  • Pre-season tune-ups that help catch wear before summer begins
Technician repairing an outdoor HVAC unit with the access panel open and a screwdriver in hand

New Air Conditioner Options That Cool Every Room Efficiently

New high-efficiency air conditioner installation

Every home is different, so we match the system to your space and priorities. As an authorized Carrier, Liberty, and Lennox dealer, we can offer reliable equipment at a range of price points. A replacement can include:


  • Equipment sized for your home and your comfort goals
  • Outdoor and indoor unit replacement as your system requires
  • A Liberty option for aging Weathermaker units, offering solid reliability without a luxury price tag
  • Smart thermostat installation for easier temperature control
  • Ductwork review, so cool air actually reaches every room


Cooling equipment has improved over the past decade, so a new system can cool more efficiently and help lower your electric bills.

Air Conditioning for New Homes and Finished Basements

A new build or a remodel is the best time to get cooling right. We can help with:


  • AC installation for new home construction, from duct layout to unit selection
  • Duct design that supports even cooling and good airflow
  • Basement finishing projects that need a system able to cool the added space
  • Ductless options for additions and spaces where ductwork is difficult
Air conditioning for new homes and finished basements

Air Conditioner Repair and Replacement FAQs

  • How long does a central air conditioner last?

    Many central air conditioners last about 15 to 20 years, depending on upkeep and how often they run. If yours is in that range and needs frequent repairs, replacement may be the smarter choice.

  • Why is my air conditioner running but not cooling?

    Causes include a dirty filter, a thermostat issue, low refrigerant, or a failing component. Check your filter and thermostat, and if the house still stays warm, schedule a service visit.

  • Why is there ice on my AC unit?

    Ice usually points to restricted airflow or a refrigerant problem. Turn the system off so the ice can melt, then call us to find the cause before running it again.

  • Should I replace my air conditioner and furnace together?

    It can make sense, especially if both are aging, because the two work as a system and a combined project can be easier to plan. We can review your equipment and help you decide.

  • What size air conditioner does my home need?

    The right size depends on your home's square footage, insulation, layout, and sun exposure. A system that is too large or too small cools poorly, so we size it to your home instead of guessing.
Black wall-mounted air conditioner with steam lines indicating cooling or heating

Beat the Heat With a Cooler, More Comfortable Home

Call (952) 451-8923 to schedule air conditioner repair or replacement with a family-run team that treats your home with care.


Available Monday through Friday, 8 a.m. to 6 p.m.