Imagine you have $500 that want to spend it on your HVAC system and you want to spend this money with goal of reducing your utility bills. Here are some simple upgrade you can make within this modest budget. After a couple years, it is very likely that you will earn most of this $500 back through your reduced utility bills.
$100 on Air Filters
The very first thing you should do it buy about $100 worth of air filters. For this much cash, you can probably get at least 15 to 20 filters. Since filters need to be replaced every 3 to 6 months, (and some systems have two filters), your supply will last anywhere from 3 to 10 years. But, if you actually have the filters in your home and are ready to put them in, you are way more likely to replace them when the time comes. Some people don't have filters on hand and end up keeping them in for years at a time. The main drawback to this is that it ends up making the inside of your furnace system dirtier and more difficult to maintain— which will eventually reduce overall airflow and efficiency.
$200 on Booster Registers
With the next $200, you should consider buying electronic booster registers. For this much cash, you can probably get 3-4 registers. But only buy them for the rooms that need them the most. These registers are extremely efficient because they increase airflow in the rooms that need the most heating or cooling. Basically, you only turn them on when necessary (and only when your AC is running). Boosters make it much easier to control the temperature in that room.
$200 on a HVAC Servicing and Duct Cleaning
Lastly, with your left over $200, you should call an air conditioning installation contractor to perform a basic tuneup and duct cleaning. If you do this once every five years, you will not only be able to spot and prevent potential problems down the line, you will definitely increase the cleanliness and efficiency of your airflow system. Obviously, there could be something wrong and the HVAC contractor might suggest that you invest in other (more expensive) upgrades. But it is always smart to fix problems that could result in bigger and more expensive problems if not fixed.
With this $500 spent, you are going to be well on your way to an improved and more efficient HVAC system.