Split System
Easy System Selector Tool
Use this tool to guide you to the best heating and cooling solution for your home.
What type of system are you trying to replace?
Choose the type of HVAC system you currently have or want to install. Not sure? Look at your existing equipment or check with your installer.
What efficiency of furnace do you need?
If you are unsure of your furnace's efficiency, go look at it. If the flue pipe coming out of it is metal, it is standard efficiency. If the flue pipe is PVC, you have a high efficient furnace.
Select Your BTU, Tonnage and Installation Layout
Select the BTU and tonnage that matches your home's size, then choose the installation layout that fits your setup.
Furnace BTU (Select One)
Please select a furnace BTU to continue.
AC Tonnage (Select One)
Please select an AC tonnage to continue.
What is the installation layout of your furnace?
Please select an installation layout to continue.
Air Conditioner (AC): Works with an indoor coil to release heat from the air, cooling the home
Furnace: Heats air and distributes it throughout the home via ductwork
Common Uses & Climates: Ideal for homes and buildings in moderate to cold climates, providing both cooling in summer and heating in winter
Heat Pump: Works with an indoor coil to both heat and cool the home by transferring heat between indoors and outdoors
Furnace: Heats air and distributes it throughout the home via ductwork
Common Uses & Climates: Ideal for homes in mild to moderate climates, offering both heating in winter and cooling in summer with greater efficiency than traditional systems
Air Conditioner (AC): Works with an indoor coil to release heat from the air, cooling the home
Air Handler: Circulates cooled air throughout the home via ductwork, with optional electric heat kits for backup emergency heating
Common Uses & Climates: Ideal for homes in hot climates, providing efficient cooling in summer
Heat Pump: Works with an indoor coil to both heat and cool the home by transferring heat between indoors and outdoors
Air Handler: Circulates heated or cooled air throughout the home via ductwork, with electric heat kits available as backup emergency heat
Common Uses & Climates: Perfect for homes in mild climates, offering energy-efficient heating in winter and cooling in summer.
Furnace: Heats air and distributes it throughout the home via ductwork
Common Uses & Climates: Ideal when you only need to replace or add a heating unit and already have a separate cooling system in place
Air Conditioner (AC): Responsible for cooling and circulating refrigerant
Coil System: Absorbs heat from indoor air and allows the refrigerant to cool it before circulating it back into the house
Common Uses & Climates: Regions with long, hot summers and mild winters that don't require much heating
How to Determine the Right BTU or Tonnage for Your HVAC System
Use the guide and tools below to find the right system size for your space.
STEP 1: LOCATE YOUR CURRENT SYSTEM'S INFO
You can usually find the BTU listed on your furnace's data sticker, often located inside the cabinet door or on the inner or outer wall of the cabinet. On an air conditioner, the data sticker is typically found on the outer panel of the outdoor condenser unit, often near the electrical disconnect box.
Look for terms like M/N, Prod, Mod No, or Model Number to identify your system. These numbers can also help you find a replacement if needed and the product manual (if you need to look up the BTU/Tonnage).
STEP 2: CALCULATING BTU AND TONNAGE
You can also use the model number to determine BTUs. You'll find an even number within the model number string. Multiply this number by 10,000 to calculate the unit's BTU.
From there, tonnage is typically calculated by dividing BTUs by 12,000 (since 1 ton = 12,000 BTUs).
If you don't have product data available, you can also use our sizing calculator to use square feet to determine your needs.
Furnace Data Sticker
Model Number: DGAT070BDF
BTU: 70,000
AC (Heat Pump) Data Sticker
Model Number: ACIQ-24-HP
BTU: 24,000 TONNAGE: 2.0
Split systems come in four types: AC or heat pump paired with either a furnace or an air handler. If you're only replacing part of your central AC system, you can also choose a furnace-only or AC/coil-only option to match your existing setup.
