Do I need an HVAC license to buy MRCOOL products?

No! MRCOOL DIY systems are designed for homeowners, contractors, and anyone handy with basic tools. You do not need a license to purchase or install most MRCOOL products.

Do you offer free shipping?

Yes. We offer free shipping to the lower 48 states on all full MRCOOL systems and most bundled packages. Smaller items may have calculated rates.

What makes MRCOOL DIY Direct different?

We are the USA’s most trusted independent MRCOOL dealer. We offer expert support, fast shipping, and exclusive early access to new generation systems and accessories.

Manual J Load Calculator

Home Square Footage (sq ft):

Number of Rooms:

Number of Windows:

Insulation Level (1-5):

Climate Zone Factor for Heating (BTU/sq ft):

Climate Zone Factor for Cooling (BTU/sq ft):

Click here: What is Home Square Footage?

The total floor area of your home in square feet. Larger homes require more heating and cooling capacity.

Click here: What is the Number of Rooms?

The total number of rooms in your home. Each room adds to the heating and cooling demand due to air circulation needs.

Click here: What is the Number of Windows?

Windows influence heat gain and loss. More windows typically mean higher heating and cooling requirements.

Click here: What is Insulation Level?

A rating of your home's insulation quality. A value of 1 means poor insulation, and 5 means excellent insulation.

Click here: What are Climate Zone Factors?

Climate Zone Factors are BTU requirements per square foot based on your region's climate. Heating zones range from 20-50 BTU/sq ft, and cooling zones range from 15-35 BTU/sq ft.