HVAC Installation in Johnson City, TN
A new system here will heat from October through April and cool from June through September every year. Tell us about the house, and a licensed contractor who covers Washington County will get in touch.
Tell us about the job
It takes about a minute.
Eleven months of work, most of it heat
In Washington County a new system runs from October through April, seven months a year, then switches over for four months of summer. Winter nights average 29°F, so the furnace or heat pump you install carries most of the load here. Summer afternoons average 85°F, warm enough that the cooling side still has to hold up its end.
Most homes here heat with electricity, so a power outage means no heat too. Washington County has had 30 winter storms and 40 damaging wind events over the past ten years, and across Tennessee, 20% of households went at least 24 hours without power in 2024. Whatever gets installed has to handle the cold and the heat, and keep working when the county takes one of those hits.
- 7 months
- October through April, your system heats
- 4 months
- June through September, it cools
- 29°F
- the average winter night it heats against
- 85°F
- the average summer afternoon it cools against
NOAA nClimDiv, 1991–2020 normals
- When should I replace my HVAC system?
- Replace it when repairs start happening every year or the system can no longer keep up on the coldest or hottest days. Furnaces and air conditioners both have a working life, and once a unit gets old, a breakdown during the winter or summer puts you in a real bind. Homes here run the heat from October through April and the AC from June through September, so the equipment gets little rest between seasons. A contractor can look at the age, the repair history, and how the equipment is performing now and tell you whether another repair makes sense or if it is time to plan a replacement.
- Should I replace my furnace and air conditioner at the same time?
- If both are old, replacing them together often makes sense, but it depends on the condition of each one. A furnace and air conditioner installed at the same time are matched to work together, and pairing new equipment with an old unit on the other side can mean that older unit fails soon after anyway. If one system is still young and running well, there is no reason to replace it early just because the other needs work. A contractor can check the age and condition of both and tell you what fits your situation.
- What happens during an HVAC installation?
- A contractor removes the old equipment, sets the new furnace or air conditioner in place, and connects it to the ductwork, the electrical supply, and, for a furnace, the gas or fuel line. If the system includes an air conditioner or heat pump, the refrigerant lines get connected and charged, and the ducts get checked for leaks or damage since they carry the air the new equipment produces. Once everything is connected, the contractor tests the system, checks the airflow, and confirms the thermostat is talking to the new equipment correctly. The length of the job depends on the equipment and the house, so a contractor can walk you through what it will involve for your system.