Bay Area Startup Launches $3,800 Plug-In Heat Pump Installed in Under an Hour

Merino Energy launched the Merino Mono in April 2026, a plug-in heat pump that the Bay Area startup says installs in under an hour with no 240V service, no EPA 608 refrigerant handling, and no structural modification. Flat price including installation: $3,800. Six California installers have signed on, including 1-888-Heat-Pumps.

Those are company claims. Worth keeping in mind.

What It Actually Is

The Merino Mono runs on a standard 120V outlet, which is the whole pitch. Conventional ductless mini-splits need a dedicated 240V circuit and licensed refrigerant work. Both of those requirements add between $800 and $2,500 to a typical install and push many California condos, ADUs, and pre-1980 homes out of reach without a service upgrade.

The Mono ships pre-charged in a sealed refrigerant loop, which Merino says eliminates the need for on-site refrigerant handling. That part is consistent with how packaged terminal air conditioners and window units have worked for decades — nothing new in the physics, but newer in the ductless heat pump form factor.

Capacity figures Merino has published: 8,000 BTU cooling, 7,500 BTU heating, down to 15°F outdoor temperature. That's enough for a single room or a small ADU in coastal California. It is not enough for a whole-house load. Anyone quoting the Mono as a furnace replacement is quoting it wrong.

The unit is wall-mounted indoor/outdoor, similar in appearance to a window AC but split and insulated. Weight per unit runs around 70 pounds. Installation is sold as a flat bundle: unit plus delivery plus mounting by a partner installer within the installer's service area.

How the Trade Should Read This

For contractors, the product is a potential entry-level offering, not a threat. Customers who would have said no to a $7,000 mini-split because of the 240V upgrade cost might say yes to a $3,800 plug-in for a sunroom or a small second bedroom. On a service call, recommending a Mono as the single-room add-on while quoting a conventional system for the main house is a reasonable play.

The warranty and service side is thinner than a Mitsubishi or Daikin. Merino offers a two-year limited warranty on the unit, longer on the compressor. The service network is the six launch installers plus Merino's own support line. If a homeowner in Fresno needs repair, there isn't a local shop with Mono parts on the shelf yet.

Similar plug-in heat pump form factors from Gradient and Midea have been on the market for a few years with mixed reviews. The Mono's differentiator is the flat-price install bundle, which cuts quoting friction. Whether six installers is enough to generate volume is the open question.

California's SB 282 permitting push would make products like the Mono even easier to deploy, since plug-in units typically require only electrical permits. For more context on the California heat pump picture, see the CAHPP 6 million unit blueprint and Title 24 2025's heat pump mandates.