Free Shipping
On Items Over $200
/ No Sales Tax
Except Illinois Orders
Welcome:  Sign In | Contact Us
Call Us: (866) 554-4328
  

What Size PTAC Do I Need?

PTAC Sizing Calculator

By 
 | 
Product Expert

Packaged terminal air conditioners (PTAC) are perfect additions to homes, offices, high-rises, or anywhere it's difficult to keep a comfortable temperature.

Sizing your PTAC correctly is a vital step in the PTAC buying process. If done incorrectly, your comfort and savings could be at risk.

If your PTAC it is too small, you'll find your unit running and running, all the while never reaching that temperature you desire. Beyond just negatively impacting your comfort, your PTAC may suffer physically from the extra wear and tear it experiences while running non-stop.

If it is sized too big, you'll likely experience temperature swings and decreased energy efficiency as your unit cycles on and off too frequently. Just like constant running of your PTAC, frequent starting and stopping, known as short-cycling, could damage your system over time. Short-cycling is also very inefficient, costing you more money than necessary over a long time period.

It's easy to be lured into using simple, rule-of-thumb sizing methods, such as square footage, to size your PTAC. Unfortunately, there are many other factors that can come into play and greatly impact your BTU requirements, such as climate, building materials, and more.

Lucky for you, we have a solution - our online PTAC sizing calculator. Our proprietary software will lead you through some brief, yet specific, questions about your space and provide the best sizing estimate you'll find from any online tool.

Step 1. Basic Info
Step 2. Room Info
Step 3. Construction
Step 4. Results
Total Load Calculations
Start Over
Cooling Load:
Heating Load:
Basic Room & Home Information
Room Size:
Zip Code:
Room Type:
Building Age:
Download As PDF
Print
* For more accurate load calculations, you can edit the detailed information below.
Skip To Results
Tell Us About Your Home
Fill out all of the fields provided to calculate your heating and cooling loads. We'll use that information to help you find the right mini split system for your home.
Select the approximate age range of your home. We will use this to make an estimate of the quality of insulation of your home.
Because different types of rooms are used differently, they have different heating and cooling needs.
Calculate Load Estimates
Temperature Information
High: 90°F | Low: 10°F
Outdoor Design Temp. determined by ZIP Code.
Next: To Wall Details
Wall Details
Select 'Yes' if this wall separates the space being conditioned from the outdoors or an unconditioned space like a garage. Otherwise, if this wall is adjacent to another conditioned space, select 'No'.
Enter the width of the wall. If only a portion of the wall is "Exposed", enter this width.
Select 'Yes' if this wall separates the space being conditioned from the outdoors or an unconditioned space like a garage. Otherwise, if this wall is adjacent to another conditioned space, select 'No'.
Enter the width of the wall. If only a portion of the wall is "Exposed", enter this width.
Select 'Yes' if this wall separates the space being conditioned from the outdoors or an unconditioned space like a garage. Otherwise, if this wall is adjacent to another conditioned space, select 'No'.
Enter the width of the wall. If only a portion of the wall is "Exposed", enter this width.
Select 'Yes' if this wall separates the space being conditioned from the outdoors or an unconditioned space like a garage. Otherwise, if this wall is adjacent to another conditioned space, select 'No'.
Enter the width of the wall. If only a portion of the wall is "Exposed", enter this width.
Next: To Window Details
Window Details
North
We assume Windows are 3'x4'. If your windows are larger or smaller, please adjust accordingly.
We assume French Doors are 3'x7'. Each half of a double door should be counted separately.
We assume Sliding Doors are 6'x7'. If your doors are larger or smaller, please adjust accordingly.
East
We assume Windows are 3'x4'. If your windows are larger or smaller, please adjust accordingly.
We assume French Doors are 3'x7'. Each half of a double door should be counted separately.
We assume Sliding Doors are 6'x7'. If your doors are larger or smaller, please adjust accordingly.
South
We assume Windows are 3'x4'. If your windows are larger or smaller, please adjust accordingly.
We assume French Doors are 3'x7'. Each half of a double door should be counted separately.
We assume Sliding Doors are 6'x7'. If your doors are larger or smaller, please adjust accordingly.
West
We assume Windows are 3'x4'. If your windows are larger or smaller, please adjust accordingly.
We assume French Doors are 3'x7'. Each half of a double door should be counted separately.
We assume Sliding Doors are 6'x7'. If your doors are larger or smaller, please adjust accordingly.
Next: To Ceiling Details
Garage Door Details
Each single garage door should be counted as 1 and each double garage door should be counted as 2.
Next: To Ceiling Details
Ceiling Details
Select 'Yes' if the ceiling separates your space from the outdoors, an attic, or any other unconditioned space. Otherwise, if there is another conditioned room above your space, select 'No'.
Enter the height of your ceiling. If you have a sloped, vaulted, or any other type of non-flat ceiling, enter the approximate average ceiling height.
Next: To Floor Details
Floor Details
Select 'Yes' if the floor separates your space from the outdoors, an unconditioned crawlspace or basment, or is a slab on grade. Otherwise, if your space is over a conditioned room, select 'No'.
Continue to Construction
Wall & Window Details
Garage Door Details
Ceiling Details
Floor Details
Previous
Submit & View Results
Basic Room & Home
Room Type
Room Size
ZIP Code
Building Age
Temperature
Edit
Avg. Outdoor Temp. High
°F
Avg. Outdoor Temp. Low
°F
Desired Indoor Cooling
°F
Desired Indoor Heating
°F
Walls
Edit
Wall Type
Wall Insulation Quality
North Wall Exposed Area
East Wall Exposed Area
South Wall Exposed Area
West Wall Exposed Area
Garage Door
Edit
# of Garage Doors
Garage Door Insulation Quality
Windows
Edit
Window Type
North Wall
East Wall
South Wall
West Wall
Ceiling
Edit
Ceiling Exposed
Ceiling Insulation Quality
Ceiling Type
Floor
Edit
Floor Exposed
Floor Insulation Quality
Floor Type
Load Results (BTU/hr)
Cooling load
Wall
Window
Ceiling
Floor
Bay
Infiltration
Internal
MRA ?
Moisture Removal Allowance: It is typical for roughly 30% of your air conditioner's capacity to be used to reduce the humidity in your home.
Total
Heating load
Wall
Window
Ceiling
Floor
Bay
Infiltration
Total
Print
Shop Mini Splits
Disclaimer: This sizing tool, although based on a version of the ACCA Manual J, is for informational use and is intended only as a guide to assist with finding the best product for your needs. Since the calculations are based on the inormation provided, Power Equipment Direct, Inc. assumes no responsability for inaccurancies resulting from improperly sized equipment. For a complete, professional sizing estimate, please call us at
866-554-HEAT (4328).
+
Email My Results
Enter your email address to receive your mini split sizing results directly in your inbox.
Thank you! We will send your results shortly.
+
If you choose to start over, all of your entered information will be lost. Do you wish to continue?


Need a More Precise Measurement?
We're here to help you get the exact product for your needs. If you need a sizing calculation more precise than what our online tool provides, give us a call at 866-554-4328 and our engineers can provide a complete, professional sizing for your space at no cost to you.

Because of the detailed work involved, these sizings take about 3-5 business days to complete. To get a head start, please fill out our sizing worksheet and send it back completed to sales@ecomfort.com or by fax to 1-866-554-4365.


NEXT: How To Pick The Perfect PTAC

 
 
Sign Up
Be The Expert: Receive Weekly How-To Tips & Specials