In partnership with Gradient

GRADIENT · INSTALLED BY ENVR AIR

All-Weather Window Heat Pump

Year-round heating and cooling that fits in your window. No construction. No electrical upgrades. Installed in under an hour.

Heats to −13°F — true cold-climate performance

Plugs into a standard 120V outlet

Replaces both your heating and window AC

Pricing

Request a quote Ask about installation

Free shipping

In the Northeast

5-year warranty

Backed by Gradient

Fast install

Under an hour

Why Gradient

A modern take on home comfort.

No construction, ever

Installs through your existing window and plugs into a standard outlet. No permits, no electrical upgrades, no walls torn open.

Heat and cool in one unit

Replaces your window AC and acts as your primary heating source — one appliance for year-round comfort, individually controlled from any room.

Built for the Northeast

Rated to heat to −13°F. Designed to perform through real winters, not just mild shoulder seasons.

The details

Technical specifications.

Minimum operating temp −13°F / −25°C

Power requirement Standard 120V outlet

Cooling capacity Up to 9,300 BTU/hr

Heating capacity Up to 9,000 BTU/hr

Refrigerant R-32 (low-GWP)

Install time Under 60 minutes

Envr Air installation

We handle the whole install.

Our team confirms your window meets Gradient’s requirements, then delivers and installs the unit in a single visit — the install itself takes about an hour. Envr Air also handles warranty service down the road.

Reach out to our team

We'll confirm your window meets Gradient's requirements — just send a few photos of the interior and exterior so we can check compatibility.

Purchase and schedule

Once your window is approved, you order the unit and we lock in a delivery and install date that works for you.

Delivered and professionally Installed

Our team arrives with your unit, installs it in about an hour, and shows you how to use it before we leave.

Common questions.

Will it work in a Northeast winter?

Yes. The Gradient All-Weather is rated to heat efficiently down to −13°F, which covers nearly every winter day in the Northeast. For context, the coldest recorded Boston temperature in the past decade was −9°F.

Does it fit in any window?

The Gradient is designed for double-hung windows, but there are specific window requirements to confirm compatibility. Reach out to our team to check if your windows will work — sending a photo of both the interior and exterior will help us give you a quick, accurate answer.

Do I need any electrical work?

No. The unit plugs into a standard 120V outlet — the same outlet your lamp uses. No upgrades, no permits, no electrician.

Can I install it myself?

No — Gradient requires professional installation by a trained team to maintain your warranty. That’s where Envr Air comes in. Our crews are certified Gradient installers who handle hundreds of these units a year, and we complete most installs in under an hour.

Ready to stay comfortableyear-round?

Get in touch