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Sync settings

Choose what your account keeps in step on every device where you are signed in.

  • My tools

    Always synced: the tools on your board, their order and size.

  • The windows open on your start page, including what you typed in them.

  • Every note in the notepad – on the notepad page, on your board and in windows.

  • Every list of website shortcuts – on the shortcuts page, on your board and in windows.

  • Every grid in the cover grid maker – on its page, on your board and in windows.

  • Every list of bookmarked organisations in the OIN lookup – on its page, on your board and in windows.

  • Keeps your pipeline and saved recipes on all your devices. Your files are never synced – only the steps and settings.

Turning something off removes it from your account straight away. Your devices keep their own copy.

Notifications

Tools that can tell you about something new while a Synsi tab is open, even when you are in another tab or app. Choose them for this browser.

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Notifications are blocked for this site. Allow them in your browser’s site settings (the icon left of the address), then switch them on here.

  • Says “New message” while a Synsi tab is open – never who wrote it or what.

Your choice is stored in this browser only. Notifications never show personal content such as a message or a number. They work while a Synsi tab is open; closed tabs get none.

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Air Conditioner Size Calculator

Estimate a room air conditioner size in BTU per hour and cooling tons from room area, sun exposure and occupancy.

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Estimated cooling capacity

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Cooling capacity

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Planning estimates only. Actual quantities and system requirements depend on product specifications, site conditions, local climate and building codes. Confirm measurements and consult a qualified professional before purchasing materials or sizing equipment.

Runs in your browser – your data never leaves your device Also available via our free API

How to use the Air Conditioner Size Calculator

  1. 1 Choose measurement units and enter the requested dimensions or values.
  2. 2 Review the quantity or capacity and check the assumptions before ordering materials or selecting equipment.

How the calculation works

The calculator uses the room-area capacity tiers and adjustments published in the ENERGY STAR room air conditioner sizing guide.

Assumptions and limitations

The guide tiers assume an 8-foot ceiling and cover rooms up to 2,500 square feet. Climate, windows, insulation, appliances and humidity can change the required capacity; get a professional cooling-load calculation for a full home or larger space.

Frequently asked questions

How does this calculation work?

The calculator uses the room-area capacity tiers and adjustments published in the [ENERGY STAR room air conditioner sizing guide](https://www.energystar.gov/products/room_air_conditioners).

What should I keep in mind?

The guide tiers assume an 8-foot ceiling and cover rooms up to 2,500 square feet. Climate, windows, insulation, appliances and humidity can change the required capacity; get a professional cooling-load calculation for a full home or larger space.

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