Frequently Asked Questions
You say the HVAC system is the most important consideration of constructing a new home. Why?
Answer:
While there are many aspects to consider when planning and designing a new home, nothing is more important than the
HVAC system. Construction types will vary, but newer construction types increase energy efficiency. Insulated Concrete
Forms [ICF] and Structural Insulated Panels [SIP's] offer increased insulation values and decrease air infiltration. This
results in a more energy efficient home. But if the HVAC system is not properly sized and installed correctly, the end result
could be disastrous. System over-sizing, leaking ducts, improper charges and air flows reduce the systems efficiency.
Unfortunately, this happens to often. Most HVAC companies do not design the systems correctly and depend on
"experience" or "rules of thumb". These methods prove inadequate and wrong nearly 100% of the time. That is an
expensive gamble and one that does not have to be taken. For more information, click here and here.
A properly designed HVAC system will provide comfort, increased indoor air quality, energy savings and years
of dependable service.
How does ACC system designs differ from that of other contractors?
Answer:
The first step in designing the system is performing a heat loss/gain calculation on the structure using the Air Conditioning
Contractors of America [ACCA] Manual J Residential Load Calculations. The ACCA standards are accepted and recognized
as the standard for residential systems nationwide. This is done by obtaining data from the structure or plans [IE:
construction type, insulation values, window and door specifications, ventilation requirements...etc] to perform the
calculation. This will show the loads imposed on the structure and allow the equipment to be selected to meet the loads.
Over-sizing or under-sizing the equipment will have a drastic effect on comfort levels, energy efficiency and system life
expectancies. The equipment is then selected by the guidelines provided in ACCA's Manual S [Equipment Selection]. The
duct system is then designed by ACCA Manual D Residential Duct Systems standard. This ensures there is no "guesswork"
in the system design. Careful installation practices will maximize system efficiency, comfort and ensure long system life
expectancies. The best system is one that is sized/designed in accordance with ACCA standards and properly
installed to the manufacturer specifications!
I am concerned about energy cost, but I have obtained other estimates and ACC's price is higher than most. Why
does your system cost more?
Answer:
This is a common occurrence and an excellent question. This industry has been reduced to a "price driven" market,
therefore contractors often "cut" another contractors price to get the job. It has been ACC's experience when this happens,
the homeowner looses. When the "price wars" begin, quality drops! "But I'm saving money, right"? Well, Yes and NO! If you
are saving money by cutting corners on quality and energy efficiencies, you will pay more long term. Much more! Plus, you
will more than likely have other problems that accompany a poor quality installation[IE warranty, comfort and energy
issues]. Is this exaggerated? Unfortunately not. Improperly installed, this will start immediately and continue through the life
span of the system.
A poorly installed 18 SEER heat pump could be less efficient that a properly installed 10 SEER model [check the article
"SEER Facts" on the links page]. Field studies have proven this over and over. Yet consumers continue choose products
by price, not considering the benefits of a quality product. ACC's quality standards are second to none and we pay
particular attention to the details that ensure a quality product energy efficient product. This is why our satisfied customers
are our best asset.
Why does a geothermal system cost so much when compared to an air source heat pump or other type of heating
system?
Answer:
The geothermal system design requires more labor to install. The earth loops have to be installed either in a "pit", "trench"
or "vertical/diagonal" configuration [see pictures below]. This requires additional labor and materials for excavating or
drilling. The installation requires additional steps to meet the manufacturers specifications. The system design [loops] will
depend upon the lay of the lot. The "pit" and "trench" loops must remain level. This can be accomplished on most lots.
Plus, these types of loops are more cost effective to install, increasing your return on investment.
Any system installed properly will require testing when the installation is completed and installed. Tests must be performed
to check airflows and refrigerant charge to manufacturers specifications. If the duct system was designed properly, very few
adjustments will be required. Balancing dampers installed on the duct system can be adjusted to "balance out" the system
ensuring even temperatures throughout the home.
What is the typical cost of a DX Geothermal System?
Answer:
That depends on the project requirements. If it is a retrofit [replacing an existing system], it is normally cheaper than a new
installation. This is because the duct system is already there and if it meets the system requirements, it can be connected
to the new system. Typically, a DX Geothermal System will cost 150-200% more than an air source system and prices start
around $3500/Ton and up. Again this depends on the system/loop design and additional features/options chosen. But
consider these important facts:
1. A geothermal system has more than twice the life expectancy of an air source unit. On a national average, the
typical air source system will require replacement in 10-14 years. This is due to the added stress of defrost
cycles and the system being exposed to varying environmental conditions. So when considering the price, add
an additional 75% of the air source price to the air source bid to allow for another air source system
replacement and then look at the equal comparison.
2. A geothermal system will provide unmatched comfort levels compared to a typical air source system.
3. A geothermal system will typically return the initial investment within a 5-7 year period.
4. A geothermal system is quieter than an air source system. There are no fans required for the compressor unit.
5. The geothermal compressor can be installed in a garage or basement to increase the visual appearance of
the homes outside decor.
6. The DX Geothermal System in residential building applications, typical annual energy savings are in the range
of 30 to 60% compared to conventional HVAC equipment.
7. DX Geothermal Systems have fewer moving parts when compared to conventional systems and water source
geothermal units. There are no outdoor fans, no defrost controls, no additional "refrigerant to water heat
exchanger's", no water circulating pumps...etc.
Why is a DX Geothermal system more efficient than a water source geothermal system?
Answer:
First of all, water source systems circulate fluid [water or a water and antifreeze/rust prohibitive solution] through the
PLASTIC ground loops. This requires the use of pump/pumps to move the medium. This requires additional energy and
reduces the systems energy saving effectiveness. Second, the copper loops used in the DX Geothermal Loops conducts
energy at a MUCH faster rate than its plastic counter part. Here is a prime example. Put a pot of water on the stove and let
it come to a boil. Then place two utensils in the water, one metal and one plastic. Leave them for 3-5 minutes and see
which one is the hottest! WARNING!!! Don't grab the METAL one!
The water source system has to transfer energy from the water into the refrigerant or vice versa depending on the
operating mode. There is always a transfer loss associated with this process. It has a tendency to get worse as the years
go on due to scaling on the heat exchanger. The DX Geothermal System circulates refrigerant through the copper loops
which is pumped by the compressor. No additional pumps are needed! Plus, the Earth's energy is transferred directly to
the refrigerant circuit eliminating energy transfer losses. It is not "rocket science", just a little common sense and simple
mathematics!
Are there any other advantages to purchasing a geothermal system?
Answer:
As a matter of fact...YES! Mortgage companies recognize the energy savings associated with geothermal systems, which
will allow you to qualify for a larger home. Since the energy bills are less, there is more funds available for purchasing your
dream home. Some utility companies also offer incentives for homeowners that upgrade to a higher efficiency system. Plus,
you can feel better knowing that you are helping to protect our environment for future generations to come. Saving money
is a nice plus too!
What can I expect to save by purchasing a DX Geothermal System?
Answer:
Simply put, it depends on how much the system is used, how it is used and your geographic location. ACC will provide you
with an energy audit comparing the DX Geothermal System to other systems of your choice. These audits have proven very
accurate and will show what you can reasonably expect to save.
Pit Loop Installation [5 Ton]
