Your Coil Specialists

swcoil_superadminCoil Failure, Coil Leaks, Corrosion, freeze event

More than 80% of heating and cooling coils in the HVAC industry don’t make it to old age and need replacing.  There are so many reasons why they fail prematurely that we can’t name them all in one newsletter.  However, we can review the most egregious ones in commercial and industrial systems. Coil Construction or Arrangement Years ago, HVAC coils … Read More

You Have Questions… We Have Answers

swcoil_superadminCentral Station Units, Corrosion, Questions

Question Marks

Each month we publish questions we receive about coils and air handler systems and applications.  There are many installations that have inherent problems that can cause lack of performance and/or system downtime.  The following are some of the problems that affect many of our customers. We service many fan coil unit systems in apartments and condominiums in the Denver metropolitan … Read More

Why Do Coils Need to be Replaced Before the Unit Needs to be Replaced?

swcoil_superadminCoil Replacement, Corrosion, plugging

rusty coil

This question is a complex question with many answers.  However, all of them fit one of three categories. These categories are, 1) inadequate coil design and/or construction, 2) adverse temperature/pressure and corrosion, and 3) inadequate maintenance.  All these reasons could be avoided if we lived in a ‘perfect” world.  Let’s examine each category a little closer. Inadequate coil design and/or … Read More

Answers to Your Coil System Problems

swcoil_superadminCoil Failure, Corrosion, Questions, Steam Coils

Periodically, we receive questions from our customers on coil system products. The following are a few answers to questions from the recent past that may prove helpful. We have a system in a local hospital with old vane-axial controllable pitch fans. These fans blow through a bank of chilled water coils. The system has always had water in the duct … Read More

Top 10 Reasons Hot Water Heating Coils Fail

swcoil_superadminCoil Failure, Corrosion, Hot Water Heating

There are many reasons why hot water coils in your system can under-perform, and some are built in at the time of the design, and many can also occur after the coils have been installed. Here are my Top Ten. 10. Air stratification issues – This means the air flow across the surface of the coil is not being evenly … Read More

The “Big Three” Causes of Coil Failure

swcoil_superadminCoil Failure, Corrosion

After decades in the coil replacement business, Southwest Coil knows that most coils are replaced well before they reach old age. In fact, about 75% of them need replacement well before their time. There are 3 major reasons – 1) adverse temperature, 2) adverse pressure, and 3) corrosion. Also, the original design could have been marginal for the application, systematic … Read More

Why Do Cooling Coils Need to be Replaced?

swcoil_superadminCooling, Corrosion, freeze event, plugging


Over my 35 years in the replacement coil business, I have been asked many times about the life expectancy of cooling coils. My answer is almost always the same. In a perfect world, most cooling coils should operate efficiently for twenty years or more. However, since we don’t live in this “perfect” world, a lack of proper maintenance, inappropriate applications, … Read More