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FAQ

Which unit is right for me?

Choosing the correct marine air conditioner depends on many variables.

We have two helpful resources:


For the most accurate sizing, we strongly suggest consulting a local HVAC professional (marine or residential)
or checking the boat manufacturer’s original specifications.

Marine air-conditioning load calculations are affected by several factors, including:

  • Cabin size and volume
  • Number, size, and type of windows
  • Amount of direct sunlight
  • Insulation quality (R-value)
  • Number of people typically onboard
  • Heat-generating equipment (electronics, refrigeration, cooking appliances, lighting, etc.)
  • Frequency of doors and hatches opening
  • Desired interior temperature

General BTU sizing guidelines (rule of thumb)

These guidelines are provided for reference only and are not a substitute for a professional load calculation:

  • Pleasure boats (average use): ~14 BTU per cubic foot
  • High sun-exposure areas (pilothouse, helm, unshaded cabins): 16–19 BTU per cubic foot
  • Below-deck spaces used mainly at night (staterooms): 10–12 BTU per cubic foot


Important: Oversizing a unit can lead to poor humidity control, as the system may cycle off too
quickly to properly dehumidify the air.

What is included in the package?
  • Neption Smart Thermostat (Wi-fi remote controllable, touchscreen display)
  • 4 mounting brackets
  • Spare temperature and humidity sensor
  • Cable for thermostat
Do I need any other items for my installation?

That depends on your specific installation.

Each unit is pre-charged, and includes the core components required to operate the system:

  • Thermostat
  • Thermostat communication cable
  • Four mounting brackets
  • Spare temperature and humidity sensor

Installation-specific items — such as seawater pumps, plumbing components, ducting, venting, grilles, and fittings — vary by vessel and layout and are not included. These items must be selected separately based on your setup.

If you are replacing an existing marine air-conditioning unit, most installations can reuse the existing set up.
Many customers refer to this as a ‘plug-and-play’ replacement.

Why MarinAire?

MarinAire sets the standard in marine air conditioning with thoughtfully engineered systems built specifically for real-world marine use. Our units combine durability, performance, and customer-focused design—without unnecessary complexity.

We are the only marine air conditioner manufacturer to include built-in pressure gauges and a built-in sound shield as standard features, making installation, diagnostics, and everyday operation easier and quieter. Every system also includes a complimentary touchscreen Wi-Fi thermostat for precise, modern climate control.

Founded in 2007, MarinAire is an American-owned company, with products invented and designed in the United States. Our systems are trusted by boat owners, technicians, and builders worldwide, and are backed by excellent customer reviews earned through consistent performance and reliable support.

What truly sets us apart is our commitment to service. When you contact MarinAire, you speak with real people, not call centers or automated systems. We offer fast shipping, responsive support, and stand behind our products with a 2-year compressor warranty for added peace of mind.

MarinAire isn’t just a product—it’s long-term reliability, honest support, and marine climate control done right.