Heating and air conditioning facts you should know.
This page gives you a very good air conditioning and heating system overview. It covers the parts of an AC system including the furnace
(mostly as it applies to air conditioning).
Information on this page.
What makes an HVAC system efficient?
When evaporator air flow is too high?
When evaporator coil air flow is too low?
When the line set is too small?
When the line set is too big?
What happens when system is dirty?
Common HVAC system problems.
Money saved based on 4 repair types.
What makes AC comfortable?
The bottom line!
More reasons to keep systems clean!
About Kelly's HVAC
What makes HVAC efficient and effective
Efficient air conditioning / heating only happens when .. the condenser, evaporator coil, furnace & line set ....
Are all matched, properly sized for your home & installed correctly!
Heating and air conditioning equipment is very tightly engineered. Each piece will only operate efficiently at set parameters. To explain:
Every inside coil (evaporator coil) is engineered for a specific air flow and BTU. This means the heater (furnace) must blow the air flow needed by
the evaporator coil. No more and no less. But that also means the condenser must also deliver the amount of BTU's the evaporator coils is designed for too.
This also means the line set must match. Plus the ducting must be able to handle the air flows too. When it all matches the whole system works at it's
most efficient rate and it lasts longer.
Everything everyone should know about HVAC systems is right here and it's accurate.
When air flow across the evaporator coil is too high?
What happens when the air flow across the evaporator coil is too high for the air conditioning system? Answer: your house will not be comfortable. The system cannot
remove excess humidity and your home becomes cool but muggy. The air conditioning runs more often for shorter cycles, consumes more electricity,
increases repair costs and wears out faster. Electricity bills can easily increase $200.00 to $600.00 per season.
When air flow across the evaporator coil is too low?
When the air flow is too low as required by the air conditioning system your house will not cool well. The unit ices up, leading to
early compressor failure. Valves wear out quickly. The whole system runs harder. It consumes more electricity, increases repairs and wears out faster.
What happens when the line set is 1 size too small?
If the line set is too small your air conditioning energy efficiency is reduced approximately 2 seer rating points. This translates to about
$256.00 in extra electricity per season. * based on 12 cents per kilowatt hour for electricity and living in an area where air conditioning is required often.
The compressor works harder and needs repair or replacement earlier.
What happens when the line set is too big?
Nothing, in fact it's okay! The compressor will be spared some work. The higher the AC efficiency rating the larger the diameter of the line set is required.
A dirty system keeps on costing you money, lots of it!
Dirty inside coils (the evaporator) from dust, hair, grease and pet fur just to name a few increase energy costs greatly.
Dirty outside coils (the condenser) from dust and oxidization cost extra electricity.
Dirt build-up and oxidization, cannot be prevented and must be removed.
A dirty non maintained system costs a minimum of 20% and more
often 30% extra electricity, adding many thousands of dollars of extra cost over the systems lifespan. A dirty non maintained system usually
costs a minimum of $500.00 in extra repair costs over a maintained air conditioning system in the first 5 years. Extra repair costs escalate greatly
with each passing year as do extra energy costs. Add the two up and it's big dollars you're spending needlessly.
Common HVAC system problems.
Problems effecting air conditioning efficiency and comfort.
These are the actual HVAC problems found in southern California homes today.
Leaky ducts cost big money all year long. Leaky ducts cost about 18% extra electric costs for air conditioning.
Plus a bigger system is needed! You spend more capital money on both air conditioning and heating equipment.
Your heating bills are higher too! Because the system runs longer repair cost goes up too. BOTTOM LINE Have your ducts
sealed or replaced once and enjoy the energy and capital savings for good.
Freon overcharge and undercharge cost energy and reduces system lifespan.
Low air flow kills systems and costs you much more energy.
Study results: Data is from appliance doctor study commissioned by SCE
Money (energy) saved based on these 4 repair types.
Actual savings based on repair type. Source appliance doctor study SCE
As you can see substantial money can be saved thru the four repairs. Additionally your equipment will last longer and require fewer additional repairs!
What makes air conditioning comfortable?
In 1923 research identified the proper indoor comfort zone. Tolerance to heat is affected by the amount of humidity in the air.
At higher temperatures humidity must be held lower to ensure comfort. Air conditioning can easily bring the temperature into the comfort range.
In fact, bigger air conditioners virtually ensure that the temperature inside can be as low as we want it.
But, cold alone is not comfortable. In fact, it is distinctly uncomfortable. To maintain comfort moisture levels must also be controlled.
This is best achieved by smaller, not larger air conditioners.
An air conditioners ability to remove moisture increases when it runs for longer periods of time. At the beginning of every cycle the air
conditioner puts moisture into the house as water evaporates from the inside coil. Once its run for 3 minutes, it begins to remove moisture.
Since a smaller air conditioner runs longer to keep the house at the temperature desired, it removes significantly more moisture than a larger unit.
When compared against a 5 ton unit a 2.5 ton unit removes 21% more humidity, while still maintaining the set temperature!
Plus you enjoy lower electricity costs and capital costs for your air conditioning and heating system!
Kept clean, properly sized, properly installed air conditioning and heating systems cut energy costs, cut repair costs,
cut capital and replacement costs.
Fact: your total costs including capital costs can be cut by many thousands of dollars over a ten year period! $12,000 to $24,000 is not out of the question*.
*average varies by house type, size, air usage habits, system age, repairs needed, quality of installation and other variables.
Big dollars under all circumstances. It should also be clear that EFFICIENT and EFFECTIVE Heating and air
conditioning is only attained through an experienced, quality orientated air conditioning contractor.
More reasons to keep HVAC systems clean?
Fact: 9 out of 10 system failures are caused by dirt and dust. (LCES) Louisiana Cooperative Extensions Service.
Fact: Clean systems restore capacity and lessen running time. Translation: Savings on heating/cooling bills, repairs and replacement costs. (LCES)
Fact: A buildup of .042 inches of dirt on a heating or cooling coil can result in a decrease in efficiency of 21%. (EPA) Environmental Protection Agency.
Fact: Most commercially purchased fiberglass filters are only 7% efficient in stopping dirt, dust, pollen, etc. from passing through it. (ASHRAE)
Keep your Heating and air conditioning system clean and you save on gas, power, repair costs and premature replacement costs!
Call us for quality air conditioning service, air conditioning repair, heater repair, heating service, change outs and ducting. Kelly's is well respected and highly reccommended.
We have been in business since 1985. We will advise you properly and in your best interest.
Over the years our customers who are well informed and have a basic understanding about air conditioning / heating make better decisions
and not able to be talked into a mistake or be mislead by bad HVAC contractors. Over the years they spend thousands of dollars less on energy,
repair and capital costs.
The basic information here on air conditioning and heating is quite easy to grasp and will serve you well, no matter where you live!