The HVAC system sizer.
Slide to your home size, then tell us about ceilings, insulation, windows, sun and people for a first estimate of cooling tonnage, airflow and heating need. Free, with no signup.
- Tons and BTU
- Airflow needed
- Free, no signup
Size up your home
A first estimate from typical Middle Tennessee conditions. A real load calculation looks at every room, window and duct, and is the only way to size a system with confidence.
- Cooling load
- Airflow needed
- Heating need
- Rule of thumb
Saved. It will travel with your estimate request below.
Seven things that change the answer.
Square footage
More space needs more capacity, but not in a straight line.
Insulation
Thin attic and wall insulation can add a large share to the load.
Windows and sun
West-facing glass is one of the biggest summer heat sources.
Ceiling height
Taller rooms hold more air to condition.
Air leakage
Drafty houses lose conditioned air all day.
Ducts
Leaky or undersized ducts can waste a large share of capacity.
People and equipment
Each person and appliance adds heat.
Get your number
A short visit turns all of this into one written price. Ask for my estimate
Ask every contractor for these six lines.
- How they calculated the load, and the numbers
- The equipment model, capacity and efficiency rating
- Whether ducts were measured and what is included for them
- Warranty terms for parts and labor
- The permit and startup process
- Total price, itemized
Sizing questions
What size system does my home need?
It depends on the home's size, insulation, windows, sun exposure and ducts, not just square footage. A rough rule is about one ton of cooling per 500 to 600 square feet, and our System Sizer gives a first estimate. A load calculation confirms it.
How much does a new air conditioner or furnace cost?
Commonly published installed prices run roughly $5,000 to $12,000 for a central air conditioner, $3,800 to $10,000 for a furnace and $5,000 to $13,000 for a heat pump, depending on size, efficiency and the work needed. Our Savings Calculator and System Sizer give a first view, and a free estimate gives you a written price.
Why is one room hotter or colder than the rest?
Common causes are undersized or leaky ducts, missing returns, sun exposure, thin insulation and a system that is too large or small. A measurement visit finds the cause, and fixes range from balancing to zoning or a ductless head.
Want a real load calculation?
Book a free estimate. We measure the home and give you the numbers behind the recommendation.