Pretty much wherever you live, it’s probably hotter than it used to be. Last year was the hottest on record, and most of the country's major cities have experienced an increase in the heat index and days with temperatures of 90 degrees or higher.
If your air conditioning isn’t cutting it but you can’t afford to replace it just yet, there’s hope: With a few easy and inexpensive steps you can give an old HVAC system a temporary boost. Here’s what you can try.
Clean the coils. The coils in your unit’s exterior condenser are essential to efficient cooling. The cleaner they are, the better your air conditioning will work, so grab a can of foaming coil cleaner, spray it on and let it work, then hose it off.
Clean the vents and ducts. Just like filters, if the vents, registers, and ducts are clogged with dust you’re not getting the best experience. Also, it’s kind of gross. Clean them thoroughly for a quick boost.
Clear the space
Some people will claim that shading your condenser unit will lower the ambient temperature and help it work more efficiently, but this is probably not true—any gains are likely inconsequential. On the other hand, putting up something to shade the unit can actually hurt its performance, because it might restrict air flow around the condenser. So instead of putting up an umbrella or building some sort of structure over your condenser to keep it safe from the sun, you’d be better off clearing the area immediately around it to help air circulate as freely as possible.
One way to boost an old HVAC system is to adjust how you use it. If you’re turning it off (or upping the thermostat) at night because it’s cooler, then cranking it up when the sun rises to torture you again, you’re actually making your system work harder and making the odds of success worse.
Seal everything
One way your house is working against your old HVAC unit is by leaking air. Check around doors and windows for drafts, and seal them up by re-caulking or adding weather stripping.
Booster fans
One trick that works whether you’re trying to cool or heat your home is installing duct booster fans. These are just fans designed to sit in your registers, boosting the airflow. While booster fans won’t fix a broken or undersized system, they can get more cool air flowing into your rooms, which can have a significant positive effect. To limit the budget damage, you can concentrate their installation on the warmest rooms in your house, which are often the ones furthest away from the condenser unit.
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