TOOLKIT

CONTROL A/C & HEAT

Your tools.
All in one place.

From the first measurement to the final decision.

01

REPAIR OR REPLACE

Cost to Keep

Compare today’s repair with replacement. See the total and monthly cost of each choice.

Open calculator
02

LOAD & AIRFLOW

System Sizer

Estimate room and whole-home cooling loads, airflow, and round flex duct sizes.

Open calculator
03

EFFICIENCY & PAYBACK

Savings Calculator

Compare SEER2 options, estimated cooling savings, and the years to pay back an upgrade.

Open calculator

Built for the conversation. Ready for the field.

Planning estimates. System Sizer is a simplified load estimate, not a certified Manual J calculation.

Your toolkit, ready to go.

Add to your iPhone or iPad

Open this app in Safari, tap Share, then Add to Home Screen. Use the new icon to open all three calculators.

Keep your place

Use the bottom tabs to switch tools without clearing your entries. Cost to Keep and System Sizer save on this device and browser. Savings entries last until you reload or close the app.

Bring in an existing study

In the original System Sizer, export your study as JSON. Open System Sizer → Saved jobs here and import it. Data from the separate apps does not transfer automatically.

Internet access is needed to open the app. Device storage is not a cloud backup. Export important studies.