Date: 15/09/2019
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What it Takes to Replace your Home HVAC

This is a story of a homeowner whose heating and air conditioning reached the end of its life. For most systems, end-of-life can be anywhere from 12-16 years, but with some intermediate repairs, this system’s life was extended to 21 years.   In the fall of 2018, when the homeowners came home from a long trip, there was no air conditioning on the first floor of the house.  Interstate AC Service came out and added refrigerant to the system which appeared to solve the problem.  However, a week later, the refrigerant had leaked out and it became clear that something more would need to be done.  Interstate AC’s  system expert, Tommy Gentry,  discussed options with the homeowners.  


The electric blower controls had been replaced two times in the last 10 years.  The existing HVAC unit was sitting on the basement floor, which made it subject to flooding.  So, the unit needed to be raised off the floor.  There were two rather small air ducts coming from the return and these needed to be enlarged.  Tommy took a lot of measurements and determined that a new 3-ton American Standard would fit the existing space and result in lower costs.  The existing heat pump was eliminated. Tommy drew up a reasonable estimate and the homeowner decided to proceed with the replacement.  Tommy provided drawings for the installers and made a list of parts that would be required. Three days later the truck arrived, and work with a two-man crew began.

  1. First, the gas was turned off, then the refrigerant was drained from the existing unit so it could be recycled.   Next, the exhaust was disconnected from the existing unit, and the old unit was removed and recycled.  Then, the area was made ready for the new furnace.
  2. A platform to go under the unit was put in place, then the blower, coils, and furnace were brought in and were put together.  Lines from the outside unit were brought inside and attached to the new unit.
  3. After a short break, Tommy brought in a load of parts, inspected the job, and helped to rebuild the new unit’s furnace exhaust.
  4. Next, they tackled the outdoor unit.  They cut the wiring and copper pipes to free the old unit so it could be removed and taken to the recycler.  The pad was prepared, and the new unit was unpacked and put into position.
  5. Wiring and copper pipes were now fitted to the new outdoor unit.  Air was evacuated from the pipes and the coils and the new unit was filled with the new, more eco-friendly, 410A refrigerant.
  6. The entire unit  - both heating and cooling – was tested.   Finally, the unit was buttoned up and connected to a new condensate pump.

The homeowner was impressed with the quality of the work and the care that Interstate AC Service took at each step of the way.  The new unit has a variable speed blower motor which makes a huge difference in reducing the noise coming from the unit.  We now have another very happy homeowner.

If you’re pondering a system replacement, let the folks at Interstate AC Service help!  If you live in the Nashville and surrounding area, give us a call at 615-832-8500.  We’re here for you!






Important Tips & Advice



You often don't think about your heating or air-conditioning system until something goes wrong. But there is so much you can do to help keep your system from breaking down. We regularly post information to help you learn what you can do to keep your system running, to save money and energy.  Search our many posts, videos, and podcasts, for valuable information that is never a sales pitch. Subscribe to receive an email when something new is posted, so you won’t miss any important tips.

Choosing a Repair Company

Whether you’re talking about heating or cooling, repairing or replacing a system, you want a company that can advise you reliably based on what is in your best interest, not based on what is convenient or what earns them the most money (commissions). We'll help you choose the best solution to fit your needs. Check out our many posts at HVAC News You Can Use and our podcasts.

Going Green

We're concerned about the environment and know all the latest technologies - such as geothermal systems, LED lights, and smart thermostats - that can reduce energy and put more "green" in your pocket!  We've provided HVAC systems in certified LEED buildings and written many posts on ways to Go Green.

The Sign of Service

We are a repair company performing a full range of commercial and residential heating, air conditioning, energy management and comfort products service, maintenance, and installation. We are a locally-owned company serving Nashville-Davidson County and the surrounding counties including Williamson, Rutherford, Wilson, Sumner, Robertson, and Cheatham.

Who We Are

Our service technicians are fully trained and experienced.  We can tackle the most complicated system to the simplest of systems – from large commercial plants to single-family homes.  Our ownership group of Eddie Hutton, Tony Anderson, Roger Eldridge,  Swaney Powers and Alan Seilbeck have over 125 years combined experience as leaders in the HVAC industry.


We are proud of our dispatchers that respond to your telephone call. When your system is down they make things happen. Our trucks are loaded with most parts needed for a quick repair. You can call day and night 7 days a week. Our normal weekday hours are 7:00AM to 5:00PM. Click on the button below to schedule a service call online. Emails and forms can only be answered weekdays from 7-5.”  

615-832-8500 Online Service Call


Did you know you should service your HVAC on a regular schedule – just like you would your car?  We have specialized maintenance programs to ensure the clean, energy efficient and safe operation of your HVAC systems.  This helps minimize service interruptions/breakdowns and maximize your equipment's lifespan.  All maintenance contract customers are assigned a primary technician that will get to know your facility and equipment and will treat it like his own.  You’ll receive discounts on repairs or new installations, and get priority service when it is cold or hot outside and you need service promptly.  Plus, maintenance contract customers are never charged overtime rates for emergency services after-hours, weekends or holidays. We’ll teach you how to save on maintenance costs by showing you things you can do yourself and when you need a technician. Here are some good posts:  Repair vs. Replace, Things to Try Before Calling for Service, Springtime Tips that Pay Off.


Our team takes on HVAC projects for office, school, retail and industrial facilities. Check out these case studies:

Replacement of a 250-ton Cooling Tower

Ductless HVAC at Brentwood Middle School