HVAC Installation in Castle Rock, CO
A new system here will heat from September through May and cool from July through July every year. Tell us about the house, and a licensed contractor who covers Douglas County will get in touch.
Tell us about the job
It takes about a minute.
A system built for nine months of heat and a hard freeze
Castle Rock asks more of a heating system than a cooling one. Winter nights average 17°F from December through February, and homes here need heat from September through May, nine months of the year. Cooling only matters in July, when afternoons average 81°F. Whatever gets installed has to be sized for that long, cold heating season first, with cooling as the shorter job it also has to do.
Most homes here heat with gas, and a new furnace has to meet the federal minimum efficiency rating before it can go in. Douglas County has also seen 92 winter storms and 97 damaging wind events over the past ten years, and in 2024, 13% of Colorado households lost power for 24 hours or more. That is worth knowing before you pick a system, since not every furnace or thermostat comes back on the same way once the power does.
- 9 months
- September through May, your system heats
- 1 months
- July through July, it cools
- 17°F
- the average winter night it heats against
- 81°F
- the average summer afternoon it cools against
NOAA nClimDiv, 1991–2020 normals
- When should I replace my HVAC system?
- Once your furnace or air conditioner is old enough that a breakdown means a real gamble, and repairs are getting more frequent, replacement starts to make more sense than another fix. Age matters here because Castle Rock homes need heat from September through May, so a furnace that fails partway through those nine months is not a small problem. If yours is struggling to keep up on the coldest nights, short-cycling, or needs a repair that costs a large share of what a new system would, that is the point to start looking at replacement instead of another patch.
- Should I replace my furnace and air conditioner at the same time?
- If both are near the end of their life, replacing them together is usually worth considering, but it is not required. The furnace and air conditioner often share a coil and the same airflow through your ducts, so pairing old equipment with new can limit what the new unit is able to do. If only one has actually failed or is clearly declining, there is no mechanical reason you cannot replace it on its own and deal with the other one later. A contractor can look at the age and condition of both and tell you whether pairing them makes sense for your house.
- What happens during an HVAC installation?
- A contractor removes the old equipment, sets the new furnace, air conditioner, or both in place, and connects them to your existing ductwork, gas line, refrigerant lines, and electrical. They then check the ducts for leaks or restrictions, since new equipment moving air through bad ductwork will not perform the way it should. Once everything is connected, they test the system, including startup, airflow, and thermostat operation, and walk through what was done before leaving. The exact steps depend on whether it is a furnace, an air conditioner, or both, and a contractor can walk through what your specific installation will involve.