RESIDENTIAL

HVAC 101

HEXCheck Modal
HVAC Split System Options

Three Main "Split System" Options

In Houston and similar climates, your investment usually falls into one of these three categories. Understanding your system helps you budget for both installation and monthly utility bills.

Gas/Electric Split System

The Traditional Setup

Outdoor: A/C Condenser

Indoor: Gas Furnace + Evaporator Coil

How it works

You use electricity to move heat out of the house in the summer and burn natural gas to create heat in the winter. It is reliable and familiar, but ties you to two different utility prices.

Dual Fuel/Hybrid System

The "Best of Both Worlds"

Outdoor: Heat Pump

Indoor: Gas Furnace + Evaporator Coil

How it works

The "intelligent" choice. The Heat Pump provides high-efficiency heating on cool days (40°F+), while the Gas Furnace acts as a powerful backup during extreme Houston freezes.

All-Electric System

The High-Efficiency Modern Choice

Outdoor: Heat Pump

Indoor: Electric Air Handler (with Heat Strips)

How it works

Zero gas involved. The Heat Pump handles both cooling and heating. During rare extreme cold, "Electric Heat Strips" provide supplemental warmth. Quiet and perfect for decarbonization.

HEATING & COOLING SYSTEM

At Hexagon Air & Heat, we take immense pride in our status as a Lennox Preferred Vendor, a distinction that reflects our unwavering commitment to technical expertise and superior customer service. By specializing in the Lennox brand, we provide our clients with access to some of the most advanced HVAC technology on the market today. Lennox condensers and heat pumps are world-renowned for their whisper-quiet operation, exceptional energy efficiency (SEER2 ratings), and “intelligent” dual-fuel capabilities that are perfectly suited for the unpredictable Houston climate. Whether you are installing a traditional split system or a high-efficiency modern heat pump, choosing a Lennox system through Hexagon Air & Heat means investing in a legacy of innovation, ultimate home comfort, and long-term utility savings.

The Air Conditioning Condenser (One-Way Street)

When your system is strictly an Air Conditioner paired with a gas furnace, the outdoor unit is a Condenser.

  • The Process: High-pressure, hot refrigerant gas is pumped from the indoor “A-coil” to the outdoor unit.

  • The Transformation: A large fan pulls outdoor air across the condenser coils. Because the refrigerant is hotter than the outside air (even on a 100°F day), the heat naturally sheds into the atmosphere.

  • The Result: As it loses heat, the gas “condenses” into a high-pressure liquid, which is then sent back inside to start the cooling process over again.

The Heat Pump: Houston’s Ultimate Humidity Fighter

When the “Dog Days of August” hit and the humidity in Harris County feels like walking into a sauna, your outdoor unit becomes your home’s most critical defender. While most people think of a Lennox Heat Pump as just an air conditioner that can also heat, its true local superpower is its ability to wring humidity out of the air.

Unlike basic systems that simply blast cold air until a thermostat setting is reached, a high-efficiency Lennox Heat Pump—installed by the experts at Hexagon Air & Heat—can operate at variable speeds. This allows it to run longer, lower-intensity cycles that pulled significantly more moisture from your indoor air. The result? You feel cooler at 75°F than you would at 70°F with a standard unit, saving you a fortune on those summer utility bills. As a Lennox Preferred Vendor, we ensure your system is calibrated specifically for the Gulf Coast climate, providing a “set it and forget it” cooling solution that keeps your home crisp and dry, even when the outdoor humidity is at 90%.

CONDENSOR UNIT

Reliable Warmth When Houston Needs It Most

For those who lived through the Arctic Freeze of 2022, the memory of temperatures dropping into the teens for days on end is still fresh. While power outages made that week a struggle for many, those who maintained power quickly learned the true value of a heating system that doesn’t flinch in extreme cold. A Lennox gas furnace is engineered for exactly those moments, standing as the industry benchmark for reliability, safety, and whisper-quiet performance during a sudden Texas deep-freeze.

As a Lennox Preferred Vendor, Hexagon Air & Heat specializes in high-efficiency models featuring advanced heat exchanger technology. These units are designed to squeeze every bit of warmth out of your fuel, ensuring your utility bills stay manageable even when the mercury stays low. By investing in a Lennox system, you aren’t just getting precise temperature control and enhanced year-round air quality—you’re investing in the “set it and forget it” peace of mind that your home will stay a sanctuary, no matter what the Houston weather brings next.

The Lennox Gas Furnace: Engineered for the Houston “Quick-Freeze”

While Houstonians spend most of the year fighting the heat, our winter “Blue Northers” can drop temperatures 40 degrees in a matter of hours. When that happens, your Lennox Gas Furnace—the industry benchmark for reliability and safety—is designed to jump into action instantly and quietly. As a Lennox Preferred Vendor, Hexagon Air & Heat specializes in installing systems that don’t just “blow hot air,” but provide precise, consistent warmth throughout your home.

The Duralok+™ Heat Exchanger: This is the heart of the system. Made from high-quality, armor-clad steel, it captures heat with incredible efficiency. It ensures that every ounce of fuel you pay for is converted into warmth for your family, while safely venting combustion byproducts outside.

Variable-Speed Blower Motor: Unlike older furnaces that are either “all on” or “all off,” Lennox variable-speed motors ramp up slowly. This prevents that uncomfortable cold blast of air at the start of a cycle and keeps your home’s temperature rock-steady.

SureLight® Ignitor: One of the most reliable ignition surfaces in the industry. It ensures your furnace starts up the first time, every time—crucial for those nights when the temperature dips into the teens.

Insulated Blower Compartment: Lennox focuses on “Whisper-Quiet” operation. Even when the furnace is working its hardest during a 2022-style arctic blast, you’ll likely only know it’s running because of how comfortable you feel.

FURNACE UNIT

The Evaporator Coil (The “Indoor Partner”)

Often called the “A-Coil” because of its shape, this is the part that sits inside your home (usually on top of or inside the furnace/air handler).

  • What it does: This is where the actual cooling happens. Cold refrigerant flows through these copper or aluminum tubes. As the blower pushes warm air across them, the refrigerant absorbs the heat from your home’s air, turning the liquid into a gas.

  • Why it matters: If this coil is dirty or leaking, your AC will run forever without cooling the house.

EVAPORATOR COIL

The Air Handler (The “Lungs” of the All-Electric System)

In your “All-Electric” section, you mention this, but a dedicated breakdown is helpful for those without gas.

  • What it does: It houses the blower motor and the evaporator coil. It is responsible for circulating the air through the ductwork.

  • Key Component: Electric Heat Strips. Explain that these are like a giant toaster—they glow red hot to provide “Emergency Heat” or “Auxiliary Heat” when the heat pump can’t keep up with a Houston freeze.

AIR HANDLER

The Thermostat (The “Brain”)

Since you are a Lennox Preferred Vendor, this is a great place to mention the Lennox iComfort® S30 or similar smart tech.

  • What it does: It’s the command center. It monitors the temperature and tells the system when to turn on or off.

  • The Tech Edge: Modern smart thermostats don’t just control temp; they manage humidity, monitor system health, and can even alert Hexagon Air & Heat if a component is failing before you even notice.

 

THERMOSTATS

Filtration & Air Purification (The “Immune System”)

Homeowners often think filters are just for dust, but they protect the equipment too.

  • What it does: Filters catch dust, pollen, and pet dander. Advanced systems (like the Lennox PureAir™) use UVA lamps and pleated filters to kill bacteria and viruses.

  • The “Pro” Tip: Explain that a clogged filter is the #1 cause of “frozen” evaporator coils and blower motor failure.

FILTRATION & AIR PURIFICATION

Refrigerant Lines (The “Circulatory System”)

These are the copper pipes that connect the outdoor unit to the indoor unit.

  • What they do: One line (the suction line) carries cold gas inside; the other (the liquid line) carries high-pressure liquid outside.

  • Visual Aid: You can describe them as the “freeway” that heat travels on to get out of your house.

REFRIGERANT LINES

Ductwork (The “Delivery System”)

Many people overlook the “V” (Ventilation) in HVAC.

  • What it does: A series of insulated tubes that distribute conditioned air to every room (Supply) and bring stale air back to the system (Return).

  • The “Houston” Connection: Mention that in our humid climate, leaky or uninsulated ducts in an attic can lead to condensation and mold.

DUCTWORK