# Central Air Conditioning: Cooling Your Home

- Link: https://greenlivingguy.com/2015/08/central-air-conditioning-cooling-your-home/
- Published: 2015-08-03T20:22:51-04:00
- Author: greenlivingguy

## Thinking About Central Air Conditioning?

If you’re thinking of switching to central air conditioning, you’re not alone. Homeowners
across the country face the same questions. What will it cost? Is it worth upgrading
from a window unit? Will comfort levels really improve? The decision carries weight
because it impacts [energy bills](https://greenlivingguy.com/2005/06/u-s-senator-domenici-says-energy-bill-debate-begins-monday/),
home value, and long-term comfort. Here’s a clear guide to help you decide.

## Energy Efficiency: Central Air Conditioning vs. Window Units

Central air conditioning is designed to cool the entire house. It uses ducts to 
distribute cold air evenly. That makes it far more [energy efficient](https://greenlivingguy.com/2014/08/asmo-charger-revolutionizing-mobile-charging/)
when cooling multiple rooms. It also runs quietly in the background. No loud box
sticking out of your window.

![Exterior view of a modern home with a ductless air conditioning unit mounted on
the wall, surrounded by green plants.](https://i0.wp.com/greenlivingguy.com/wp-content/
uploads/2015/08/image-1.png?resize=400%2C300&ssl=1)

A modern outdoor HVAC unit, showcasing energy-efficient cooling technology for homes.

Window units, on the other hand, use less electricity in the short term. Why? They
only cool a single space. For a small apartment or one bedroom, that’s fine. But
if you try to cool an entire house with multiple window units, the [energy bills](https://greenlivingguy.com/2011/04/bipartisan-efforts-in-2005-energy-bill-led-to-significant-energy-efficiency-gains-aceee/)
skyrocket. Each unit runs separately, using more electricity than a properly sized
central system.

Some homeowners use a hybrid approach. They run central air during the day to keep
the house cool, then switch on a window unit at night in a single bedroom. A reputable
contractor, like [United Air Conditioning](https://www.unitedairconditioning.com),
can explain how this strategy reduces overall costs while keeping comfort high.

### Understanding SEER Ratings

Every central air conditioning unit comes with a SEER rating. SEER stands for Seasonal
[Energy Efficiency](https://greenlivingguy.com/2020/06/envision-goes-patent-pending-for-floods-with-solar-ev-charging-station/)
Ratio. It measures how efficiently the system converts electricity into cooling 
over an entire season.

![Outdoor unit of a central air conditioning system placed next to a house, with
grass and plants in the foreground and warm evening lighting.](https://i0.wp.com/
greenlivingguy.com/wp-content/uploads/2015/08/IMG_5637.png?resize=400%2C300&ssl=
1)

A modern ductless air conditioning unit installed outside a home, demonstrating 
an efficient cooling solution for residences without existing ductwork.

Since January 26, 2006, all new central air units must have a SEER rating of at 
least 13. Many modern units now reach 16, 18, or even 20. Older systems, especially
those installed before the early 2000s, sometimes carry ratings under 6. That means
they use nearly twice as much energy to do the same work.

The bottom line: the higher the SEER rating, the [lower your energy bills](https://greenlivingguy.com/2020/04/lowering-energy-bills-by-replacing-your-windows/).
When shopping for a new system, always check this number first. It directly impacts
[operating costs](https://greenlivingguy.com/2014/02/philips-spacewise-led-system-selected-to-participate-in-gsas-green-proving-ground-program-for-potential-to-reduce-lighting-energy-and-operational-costs-by-50-to-75-percent/)
and environmental footprint.

### Fan-Only Operation Saves Money

Another feature worth noting is “fan only” mode. This allows you to run the fan 
without cooling. At night, or on cooler days, you may only need air circulation.
Running the fan moves fresh air through the house without turning on the compressor.

This simple setting can save a substantial amount of money each month. Instead of
chilling the air, you’re simply moving it. Many homeowners underestimate how effective
fan mode can be. In climates with cooler evenings, this option becomes an essential
energy-saving tool.

![A modern ductless air conditioning unit installed outside a house, surrounded 
by vibrant greenery and pink ambient lighting.](https://i0.wp.com/greenlivingguy.
com/wp-content/uploads/2015/08/IMG_5636.png?resize=400%2C300&ssl=1)

A modern ductless air conditioning unit set against a stylish house exterior, showcasing
its efficiency and aesthetic appeal.

### Another Central Air Conditioning: Split Ductless Systems for Older Homes

Not every home is built with ductwork. In older houses, installing ducts can mean
tearing into walls and ceilings, which drives up cost. That’s where split ductless
systems step in.

A ductless system places small air handlers in each room. These units mount high
on the wall and connect to an outdoor compressor. The system delivers cool air directly
into each room. Vents remain hidden, preserving aesthetics while providing modern
comfort.

Ductless systems tend to cost more upfront than central systems. However, for homes
without existing ductwork, they often make the most sense. They also allow for zoned
cooling. You can keep the living room cool during the day and the bedroom cool at
night, while leaving unused rooms untouched. That flexibility [saves money](https://greenlivingguy.com/2022/08/10-environmental-benefits-of-gardening-at-home/)
in the long run.

### Hiring the Right Contractor

Choosing the right contractor can make or break your installation. Start by asking
for proof of bonding and insurance. If a company can’t provide documentation, don’t
do business with them. Period.

Next, check with the Better Business Bureau. Every company collects some complaints,
but unresolved complaints signal a problem. Watch for patterns of billing disputes
or unaddressed service issues. These red flags show a contractor who may take your
money without delivering results.

Beyond ratings, certification matters. Look for contractors certified by groups 
like North American Technician Excellence (NATE) or HVAC Excellence. These organizations
[set industry standards](https://greenlivingguy.com/2025/07/penn-state-clean-lithium-sets-new-industry-standards/)
for training and knowledge. Certification proves your contractor has the skills 
to handle the job.

Experience also counts. Not every contractor specializes in HVAC systems. Ask about
their track record. A qualified installer should provide a room-by-room analysis
of your home’s cooling needs. They should calculate ductwork requirements if your
house doesn’t already have ducts. They should print detailed designs, assumptions,
and a clear estimate.

Avoid contractors who rely on vague “rules of thumb.” If they can’t show you the
math behind their recommendation, keep looking.

### The Bigger Picture: Comfort, Cost, and Value

Switching to central air means more than comfort. It raises the value of your home.
Buyers see central cooling as a premium feature. In hot climates, it’s often considered
essential.

Yes, the upfront cost is higher than buying a few window units. But over time, the
efficiency of central air pays off. You’ll spend less per square foot of cooling,
especially if your unit has a strong SEER rating and fan-only options. Combine that
with regular maintenance, and your system can last 15 to 20 years.

Ductless systems also increase property value in older homes, since they provide
modern cooling without costly construction. Either way, the investment improves 
your living space and your long-term financial return.

### Final Word

Deciding between central air conditioning and window units comes down to your home,
your budget, and your comfort needs. Central air conditioning provides whole-home
efficiency, a quieter experience, and long-term savings. Window units work for small
spaces but struggle to keep up in larger homes.

If you choose central air conditioning, hire a reputable contractor. Verify credentials.
Demand detailed calculations. Insist on proper certifications. With the right installer,
you’ll get a system that delivers comfort, efficiency, and peace of mind.

Author: Amanda S. Evans is an HVAC parts and systems supplier. She shares her industry
experience on DIY and homeowner blogs.

## Comments

### By: Mark

- Link: https://greenlivingguy.com/2015/08/central-air-conditioning-cooling-your-home/#comment-21341
- Published: 2015-08-05T09:08:09-04:00

I really would like to praise you for writing such a fabulous article.