CIG makes virtually every type of round tube / plate fin (RTPF) coil and heat exchanger, including water coils, condenser coils, and evaporator coils, for both air conditioning and refrigeration, whether for residential OEM air conditioners or one-off made-to-fit and custom commercial coils. We make transport refrigeration coils, truck and bus air conditioning coils, marine coils, and industrial coils.  We make coils.  Any kind, any size, we can do it.


Quality Products

We use seamless copper and aluminum tubes mechanically expanded into full collar, aluminum or copper fins.  Our three factories are highly automated, with automated fin press machines, hairpin benders, CNC machines, auto-brazing machinery, as well as the latest testing technology. 


Coil Capabilities

We can handle almost any coil for both air conditioning and refrigeration: condenser coils, evaporator coils, and fluid coolers.

  • Tube sizes: 5mm, 1/4 inch, 7mm, 5/16 inch (7.94mm), 3/8 inch (9.52mm), 1/2 inch and 5/8 inch
  • Tube thickness: we stock a variety of thicknesses for most tube sizes
  • Tube and fin materials: aluminum, copper, aluminum clad copper, cupro/nickel, and stainless steel
  • Rows: 1 row to 24 rows
  • Fin materials: aluminum and copper, and pre-coated aluminum
  • Fin patterns: we currently offer 13 varieties of fin patterns  (see Fin_Pattern_Diagram_PDF)
  • Fin edges: straight edge and ripple edge
  • Fin surfaces:  plain, flat, corrugated, louver, raise lance, sine wave, sine wave slit surface and super slit
  • Fin spacing: 4 FPI to 26 FPI
  • Headers: aluminum, steel, copper, galvanized and stainless steel
  • Protective coatings: hydrophilic protective coated fins, gold, blue, or milk


Coil Selection and Coil Rating

At CIG, we use a state-of-the-art HVAC coil selection program that automatically calculates the optimum size of the coil and number of rows, and fins per inch based on the stated performance requirements. Likewise, a given coil design can be rated for performance, calculating the amount of heat transfer to be achieved. The thoughtful and careful use of the selection program can yield the correct pressure drop at the lowest reasonable cost to fill a particular requirement.



Leak Testing

We operate four types of leak testing, including water tank testing, helium sniffer testing, fatigue testing and burst testing. Every coil and connecter that we make gets tested for leaks.


Bubble Leak Test. Every coil is subjected to an underwater bubble leak test at a minimum 380 psi. For higher pressure applications, we apply 600 psi up to 1,000 psi, according to our customer specifications. Tests are normally conducted for 10 minutes to identify leaks in brazing, which are then identified, marked and repaired. 

Helium Vacuum Chamber Leak Test. Our #2 Factory in Chonburi is also equipped with a helium vacuum chamber to test for leaks per customer specification. A coil is placed in the enclosed vacuum chamber and then filled with helium gas. The leak detection is performed by a helium mass spectrometer that can detect even a few nanograms of escaped helium.

Helium Sniffer Leak Test. Our factories are also equipped with portable helium leak detectors. Specifically, we offer, according to customer specifications, full-time leak testing on the factory line by mass spectrometer leak sniffers that are made specifically for the HVAC industry.


Design and Performance Testing

In addition to the daily leak testing that we offer for each and every coil, we also perform tests on all new designs or specifications, including fatigue testing and burst testing. The industry trend toward smaller aluminum tubes and higher pressure calls for periodic testing to insure confidence in the final product.




Our Products


Condenser Coils

Condenser coils can be designed to match any system requirements. Circuiting can be matched to heat transfer volume requirements and coil face area can be split to your particular requirements.

Tube material

  • Copper
  • Aluminum
  • Copper nickel

Additional tube material available upon request

Fin material

  • Copper
  • Precoated aluminum
  • Copper nickel

Additional fin material available upon request

  • Commercial or residential air conditioning coils
  • Split coils and intertwined coils
  • Booster coils
  • Made-to-Fit and custom coils
  • Direct Expansion (DX) coils
  • Commercial and industrial refrigeration
  • Mobile air conditioning
  • Commercial and residential air conditioning
  • Heat pump


Evaporator Coils

We make evaporator coils for a wide range temperatures, from HVAC&R to subzero freezing applications. 


Tube material

  • Copper
  • Aluminum
  • Copper nickel

Additional tube material are available upon request

Fin material

  • Aluminum
  • Copper
  • Precoated aluminum

Additional fin material including carbon steel and stainless steel available upon request

  • OEM evaporator coils
  • Industrial & Commercial refrigerator coils
  • Mobile air conditioning
  • Commercial and residential air conditioning 
  • Heat pump









Water Coils

Water is the most abundant medium for heating and cooling applications. Fortunately, there's a water coil from CIG for just about any hot or cold water application. Coils are designed to withstand 250 psi maximum operating pressures and a maximum fluid temperature of 300°F for standard duty copper tube coils. Higher limits are available depending on coil construction and/or materials used. We can manufacturer up to 11m in length (or even more!). Our coil design team is available to provide you with the right coil design and our CoilExpress™ program can speed up the coil production so you can get your replacement coils within a few days.

Cleanable water or fluid coils are also available.

Tube material

  • Copper
  • Copper nickel
  • Stainless steel

Additional tube material available upon request

Fin material

  • Aluminum
  • Copper

Additional fin material available upon request




Chilled Water Coils

Pure water cooling coils or glycol solution coils. We can help with a variety of chilled water systems, whether constant volume, variable volume, or variable primary flow chilled water systems (VPF). We can duplicate an old coil, redesign obsolete coils or provide custom design for new applications.

Hot Water Coils

Applications include booster heat, reheat, waste heat reclamation, pre-heat, fluid process heat & more. We can start from scratch or can duplicate an obsolete design and match existing dimensions and performance; any size, capacity shape or circuit. 



Truck and Bus Air Conditioning Coils



CIG serves the growing automotive industry in Thailand by producing condenser and evaporator coils for some of the world's leading truck and bus air conditioning companies. We make OEM, ODM and aftermarket products for truck & bus air conditioning. Our all aluminum coils provide lightweight solution for all transportation needs.


Tube material

  • Copper
  • Aluminum

Additional tube material available upon request

Fin material

  • Aluminum
  • Copper



Replacement Coils

We only need to know the coil type, rows, fin surface, height and length, and can provide a firm quotation. We can even quote multiple options for materials, tube size and fin per inch etc. We also have on-site coil measurement service (available only in Thailand and Australia). We can manufacturer up to 11m in length (or even more!). Our coil design team is available to provide you with the right coil design and our CoilExpress™ program can speed up the coil production so you can get your replacement coils within days.




All Aluminium Coils

CIG is the first plant in Southeast Asia to manufacture all-aluminum coils with high standards for use with transportation, residential, commercial and industrial applications. Our all-aluminum coils boast lighter weight and economical cost with dedicated facility for aluminum production.


  • Condenser and Evaporator Coil
  • Chilled and Hot Water Coil (<148C)
  • 30% less cost and weight
  • 7 mm, 5/16", 3/8", 1/2", 5/8" Aluminium OD tube
  • All applications as well as copper tube plus Ammonia refrigerant
  • Brazing between Aluminium & Copper tube available
  • Environmental Friendly



5 mm OD Copper Tube

5mm diameter tubing coils are suitable for use in residential and commercial applications where unit size is a concern. Our 5mm coil series are small in size and can withstand high pressure hence suitable for CO2 refrigerant. Small copper tube is economical and eco-friendly.

  • 5 mm OD Copper Tube
  • Smaller size, Light weight
  • MoneySaving, EnergySaving
  • Higher heat transfer coefficients, Less refrigerant
  • Suitable for R410 a Small copper tube is economical and eco-friendly



Air Handling Unit Coils



We make all kinds of coils for Air Handling Units (AHUs) including chilled water coils, steam coils and evaporator coils. We can design from specifications to match existing dimensions and performance, in copper tube aluminum fin, any size or capacity.






Refrigeration Coils

  • Refrigerating coils
  • Industrial air conditioning coils
  • Industrial refrigerating coils
  • Display cabinet coils (high collar)
  • Commercial refrigerating coils
  • Industrial refrigeration equipment coils




Coils for Industrial Applications

In addition to the HVAC/R industry, we serve a number of industrial markets:

  • Aeronautics industry
  • Beverage, dairy and food processing
  • Petrochemical and gas compression
  • Power generation



Heat Exchangers

We can design or duplicate many types of existing heat exchangers in a variety of materials.




  • Plate heat exchangers and plate fin heat exchangers
  • Fluid heat exchangers
  • Phase-change heat exchangers
  • Spiral heat exchangers








Tube Bundles

We can duplicate many types of existing bundles to include dimensions, materials and performance. We can build U-tube bundles, straight-tube floating bundles, hairpin tubes, and we can retube heat exchangers when the bundle is not removable. We are not locked into any one material; we offer: carbon steel, stainless steel, cupro-nickel, admiralty brass and many others.


Comparison_between_different_AC_coils_CIG_offered (pdf)