Is your HVAC system the right size?
Upload your Ecobee thermostat data and find out in minutes. No sign-up required. All data stays in your browser.
Why Use HVAC Right-Size?
100% Private
Your data never leaves your browser. No accounts, no uploads to servers.
Instant Results
Get your sizing analysis in seconds. No waiting for manual calculations.
Data-Driven
Uses real runtime data from your thermostat, not rules of thumb or square footage estimates.
How It Works
1
Download Your Data
Export runtime data from your Ecobee thermostat as CSV files.
2
Upload & Parse
Drop your CSV files here. We parse them instantly in your browser.
3
Run Analysis
We calculate your actual heating/cooling load from runtime patterns.
4
Get Results
See if your system is oversized, undersized, or just right.
Ready to find out?
Upload your thermostat data and get a personalized sizing recommendation in minutes.