Humidity & Temperature Controlled Air Makeup Units

Climate Controlled Paint Booths & Environmental Rooms

For aerospace, defense, and other high-spec finishing operations, controlling temperature and humidity is not optional—it’s the only way to consistently meet strict paint specifications and OEM guidelines. At Paintbooth.com, humidity- and temperature-controlled Air Make-Up Units (AMUs) are one of our specialties. While many manufacturers avoid these complex systems, our team designs and supports them every year for demanding applications across the U.S.

Why Control Temperature & Humidity?

If your paint process requires parts to be coated within a tight temperature and relative humidity window, a standard booth won’t cut it. Humidity-Temperature Controlled AMUs help you:

Maintain consistent film build and cure quality
Reduce rework, rejects, and downtime
Hit OEM, aerospace, and defense specifications
Create a repeatable environment regardless of outdoor conditions

These systems can be designed as 100% outside air units or recirculating systems with energy-saving modes.

Recirculating vs 100% Outside Air

We can configure your AMU in two primary ways:

100% Outside Air AMUs
Simpler design
All air is fresh, conditioned air from outdoors
Often used where recirculation is restricted or not required
Recirculating AMUs
Blend of recirculated and fresh air
Lower required CFM and smaller exhaust fans, reducing operating cost
Additional code-required safety features and EHS considerations are built into the design

For aerospace and defense booths, we commonly integrate NESHAP-compliant 3-stage exhaust filtration as part of the system design.

Temperatur Controlled AMU Unit

Allen Bradley Temp Controlled HMI

Packaged DX Unit

Large Carrier Chiller

Two HVAC Units

Temperature Controlled Units Installed

Titan Temp Controlled AMU

Basic PLC

Cooling Options: Chilled Water vs DX Packaged Units

We typically use one of two cooling strategies:

Chilled Water Systems

Best suited for larger paint booths and environmental rooms, chilled water systems are:

More energy-efficient at larger capacities
Known for longer equipment life
Able to serve multiple booths or rooms from a single chiller
Flexible in placement—the chiller can be on the ground or roof

Control advantages include:

Better turndown ratios for tight temperature control
On-demand pumps for improved efficiency
No refrigerant in the AMU airstream (important since many newer refrigerants have a flashpoint)
Use of a chilled water valve and VFD-controlled pump to provide more stable booth conditions, rather than simply staging compressors on and off

Tap a cooling option to compare systems

Chilled Water Coil HVAC Equipment

Paintbooth.com offers chilled water coil HVAC equipment designed to deliver reliable cooling performance for commercial and industrial air handling systems. Our chilled water units are engineered using conservative coil and blower design standards, ensuring the equipment delivers the proper airflow and cooling capacity required for each application.

Reliable cooling performance
Conservative coil and blower design
Precise temperature control

High-performance chilled water cooling coils
Properly matched blowers for balanced airflow
Factory-supplied or field-supplied modulating water valves
Optional dehumidification systems and reheat configurations for humidity control

Applications These systems are commonly used in industrial ventilation systems, manufacturing facilities, paint booth makeup air units, process cooling applications, and commercial air handling systems where precise temperature control and dependable airflow are critical.

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