800-361-2298 estimating@alltherm.us

Residential & Small Business HVAC

Efficient solutions to meet your heating and cooling needs.


ALLTHERM specializes in finding efficient solutions to meet the heating and cooling needs of residential customers in southern Maine. As an Efficiency Maine qualified partner and residential vendor, we remain up to date with incentives that make it easier to incorporate newer technologies like ductless mini-split heat pumps. We complete all the paperwork for you, so you don’t have to.

Why do we offer a free quote?

Every home is designed differently and every homeowner uses their home uniquely. Visiting your home allows us to better understand what your needs are so we can offer you a variety of solutions for you to consider. It also allows us to answer your specific questions regarding your home.

What is a heat pump?

Heat pumps have two main components. The outside condensing unit which houses the inverter-driven compressor and the indoor air handler which delivers the conditioned air. Mini-split heat pumps have many different options for indoor units; they come in different shapes and capacities for an easy mix-and-match solution.

How does a heat pump work?

Heat pumps transfer heat much like a refrigerator does. Because refrigerants have a very low boiling point, heat pumps can transfer heat that is absorbed by the refrigerant copper lines even when its cold outside. Because heat pumps move heat and do not create it, heat pumps can deliver up to 4 times the heat for the energy that is consumed to move the heat. The beauty of the heat pump is the ability to move heat in either direction, so homeowners have the option of heating or cooling.

Are all heat pumps or mini-splits ductless?

No, heat pumps can be ducted or ductless. Many homeowners are choosing the ductless mini-split heat pumps to provide efficient heating and cooling without the added expense of ductwork.

What type of maintenance is required?

Mini-split heat pumps require very little maintenance. Easily accessible filters require periodic cleaning which can be done by the homeowner.

What is the difference between a single-zone and a multi-zone heat pump?

A single zone system pairs one condensing unit with one indoor unit. A multi-zone system splits a home or office into multiple indoor zones (up to five zones) that can be controlled separately. Each indoor unit is piped to the same outdoor condensing unit. Single zone systems are often used to supplement current systems that don’t quite meet the needs of the homeowner or small business. A multi-zone system is typically used to treat several areas at one time. Depending on the configuration, homeowners may reserve ports for future use; installing additional indoor units later.

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Client Testimonials

ALLTHERM impressed me with their ability to meet a very tight schedule which was complicated by structural demo constraints and the worst winter on record. They have never failed me and is a resource in assisting with value-engineering.

Mike C.

Project Manager

They have been diligent to meet all the needs of our clients and always keep to the schedule, while maintaining a high standard of quality. I would recommend ALLTHERM for all your HVAC needs.

Karen C.

General Contractor

The installation was exceptional and flawless. JimBob is a true professional contractor and gets the job done in a timely fashion and within your budget. I highly recommend ALLTHERM.

Joel G.


We’ve been doing business with ALLTHERM for nearly 20 years. They are a true pioneer in the industry.

Joe S.


Jim Bob helped us out at the Fair Oaks Mall with the value engineering he provided. They ended up orchestrating an Erickson helicopter pick which took 30 minutes, in lieu of the crane service that would take a full week to do the same task! This was invaluable to our client.

Robert L.

Project Manager

Jim has used his professional expertise to make a difference in our communities. He has invested countless hours helping nonprofit organizations, like mine, renovate buildings to provide marginalized people with housing, employment, and life skills in a way that changes lives and makes our community better.

Ken H.


ALLTHERM is one of the best traveling contractors out there. They have always been team players and look to ensure the best product for the client. I recommend using ALLTHERM if you desire to work with an exceptional HVAC contractor, who knows how to get the job done right.

Rick M.


Jim’s value engineering not only saved us money while maintaining the intent of the drawings, but were innovative from a design standpoint. He always thinks of a better way to do something. He is a trusted industry partner and a great source of information.

Larry S.

Business Owner