Split Systems and Package Units

In our last post, we discussed some of the basics regarding Air conditioners. Hopefully it didn't put you all to sleep, because this time, we are going to talk about the two most common types of air conditioning and heating systems, split systems and package units.

>Jason: Both of these have the exact same components, and perform the exact same tasks - heating and cooling your home. The only difference between the two is layout. I'm going to start with the package unit. Being the least efficient of the two, package units combine the heat exchanger (your furnace) and the condensing unit (your AC) into one box, usually found on your roof. These tend to be less efficient because there has been less research and development due to lack of demand. This is because most package units are only found in the southwest (Nevada, California, Arizona and New Mexico). So if you are not in one of these states, skip ahead to split systems. If you have a package unit already, it is probably best to buy a new package unit when replacing your heating and AC rather than to redesign your entire AC system.

>Ken: OK, let's not get into the relative benefits of either one except to say that split systems are the most common, usually with the furnace in the attic and the condenser outside your bedroom window keeping you awake at night. If you're wanting to replace the units, try to purchase the most efficient units that you can afford. The absolute best units will have multiple stages of heating and cooling and variable-speed control of the fan. This gives the system the ability to operate at its highest speed of cooling or heating when you get home (after a hard day of work) to bring the house to a comfortable temperature the fastest. Then when the home is comfortable, the unit drops down to a very low level to maintain the temperature, which is a MUCH cheaper way to keep your home comfortable than if the unit is turning on and off every 10 minutes all night.

>Jason: So to wrap up, if you want to replace your existing system, first check to see if you have a package unit or split system. Then, depending on what you already have, ask contractors for their most efficient units, and prices. If you are replacing a split system, ask the contractor about variable speed fans and two-stage heating and cooling. This will scare them into thinking that you really know what you are talking about. Good luck, and until next time - stay Energy Smart!