The Knot Hot Field Guide

Better comfort starts with better questions.

Practical guidance for marine air, vessel HVAC, onboard refrigeration and life at sea across South Florida.

Why Is My Boat AC Not Cooling?

Start with airflow, seawater flow, power and the conditions aboard—then know when to stop troubleshooting and request marine air service.

A season-ready checklist for airflow, heat-rejection performance, condensate, controls and the records that help protect onboard comfort.

The right decision starts with a confirmed fault, then weighs vessel fit, equipment condition, serviceability and the way the boat is used.

When one cabin is warm and the rest of the vessel is comfortable, the pattern can help narrow the onboard HVAC diagnosis.

A practical checklist for multi-zone comfort systems, from cabin airflow and condensate to controls and service records.

A yacht HVAC decision should account for every connected zone, control, electrical load and installation constraint.

Salt and moisture reach cabinets, coils, fasteners and electrical connections throughout an onboard climate system.

A cool cabin can still feel damp when moisture sources, ventilation and onboard HVAC operation are out of balance.

Document equipment, understand vessel shutdown steps and leave visibly damaged marine HVAC systems off until they are evaluated.

Need a diagnosis?

Speak with Knot Hot at (954) 881-8893, or send the vessel location and symptoms for a callback or email response.