Low superheat can flood your compressor. That will ruin the compressor, and you will likely have to spend $1000s for a new air conditioner. That’s why it’s very useful to understand what causes low superheat and how to fix it. We are going to cover all 6 low superheat causes, going one-by-one, detailing why low … Read more
High superheat is an AC problem that won’t go away by itself (except due to the #4 cause). We have to fix high superheat. In order to do that, it’s particularly useful to understand what causes high superheat in air conditioners. There are 6 common high superheat culprits that we always check, and we’ll go … Read more
One of our readers asked us if there is a target subcooling chart. Namely, we do have the most extensive target superheat chart here; shouldn’t there be a similar target subcooling chart as well? Well, there is none. That’s because the target subcooling doesn’t significantly depend on the outdoor temperature (like the target superheat). Example: … Read more
When diagnosing air conditioners, you will probably need to consult the target superheat chart. Here we are going to take a structured approach to how to calculate and use target superheat. Namely, we are going to go through these 4 very useful resources for target superheat: Target Superheat Formula. In order to calculate target superheat, … Read more
Do you know what’s easy? Calculating subcooling. It’s a piece-of-cake calculation. We are going to explain exactly how to calculate subcooling in much the same manner as we explained superheat calculation with R-22, R-410A, and R-134A examples here. In this article, you will similarly get 3 key resources that will explain everything to know about … Read more
Calculating superheat in HVAC is super easy. We only need 2 temperature measurements and a minimal amount of math. We are going to show you exactly how to calculate superheat. To help you out, we have prepared these 3 valuable resources: Superheat Formula. This is a very simple equation anybody can use to calculate superheat … Read more
Let’s learn exactly how to measure subcooling. Measuring subcooling follows a very similar procedure as measuring superheat (detailed here) but with important differences. We are still going to need 3 key tools; a manifold gauge (red high side part), a clamp-on thermometer, and the easiest subtraction math. Subcooling is measured at the high side liquid … Read more
Measuring superheat is not all that difficult. All you need are a manifold gauge, a clamp-on thermometer, and a bit of math. We will show you exactly how to measure the superheat for any air conditioner (central air conditioner, split system ACs unit, etc.). We are going to include a step-by-step way of how to … Read more
Superheat is one of the most commonly used terms in HVAC. We use quite a lot of superheat and subcooling calculations as the No. 1 air conditioner diagnostic tool. It is only appropriate that we adequately define what superheat and what subcooling are. Example: You will very often see an HVAC technician with a manifold … Read more
Let’s clear this up: It is not normal for a split AC indoor unit to drip water indoors. If you see the water below the split AC indoor unit (stains on the wall, puddle on the floor, soaked carpet under the air handler), you do need to be alarmed. We are going to go through … Read more