Complete HVAC Guide

Everything you need to know
about HVAC systems

Types of systems, refrigerant gases, parts that fail most often, and how to keep your HVAC running efficiently in the Dallas heat.

6
System types
5
Refrigerant gases
12
Common failure parts
15-25
Years avg lifespan
System types Refrigerant gases Parts that fail Dallas tips
System types
Types of HVAC systems
Each system has different components, efficiency levels, and maintenance needs. Knowing your system helps you spot problems early.
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Central Split System
Most common in Dallas homes
The standard for most American homes. An outdoor condenser unit and an indoor air handler connected by refrigerant lines. Works with a furnace for heating and AC for cooling.
Efficiency
14-26 SEER
Lifespan
15-20 years
Install cost
$3,000-$7,000
Best for
Most homes
Most popular
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Heat Pump System
Heats and cools in one unit
Works as both heater and air conditioner by reversing the refrigerant cycle. Very efficient in mild climates. In Dallas winters, often paired with a gas furnace as backup.
Efficiency
15-22 SEER
Lifespan
12-15 years
Install cost
$4,000-$8,000
Best for
Mild climates
Energy efficient
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Ductless Mini-Split
No ductwork needed
Outdoor compressor connected to one or more indoor wall units. No ducts means no energy loss through ductwork. Ideal for room additions, garages, or homes without existing ducts.
Efficiency
16-30+ SEER
Lifespan
15-20 years
Install cost
$2,000-$5,000
Best for
Additions, garages
Highest efficiency
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Packaged Unit
All-in-one on the roof or ground
All components (compressor, coils, air handler) in one cabinet installed outside. Common in commercial buildings and homes without basements. Simple to maintain and service.
Efficiency
13-18 SEER
Lifespan
12-15 years
Install cost
$3,500-$7,500
Best for
Slab foundations
Easy to service
🌡️
Geothermal System
Uses earth temperature
Uses stable underground temperatures to heat and cool. Extremely efficient but expensive to install. Very rare in Dallas but growing due to energy savings.
Efficiency
300-500% COP
Lifespan
20-25 years
Install cost
$15,000-$30,000
Best for
Large properties
Most eco-friendly
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Dual Fuel System
Heat pump + gas furnace combo
Combines a heat pump with a gas furnace. The heat pump handles mild weather efficiently; the furnace kicks in when temperatures drop below freezing. Perfect for Dallas winters.
Efficiency
16-20 SEER
Lifespan
15-20 years
Install cost
$5,000-$10,000
Best for
Texas climate
Great for DFW
Refrigerants
Refrigerant gases explained
The refrigerant is the lifeblood of your AC system. Using the wrong type can destroy your compressor. Know which one your system uses.
R-22
Also known as Freon
TypeHCFC (hydrochlorofluorocarbon)
Used inSystems made before 2010
Ozone impactVery high — depletes ozone
Current price$100-$200 per lb
GWP1,810
Banned since 2020
R-410A
Also known as Puron
TypeHFC (hydrofluorocarbon)
Used in2010-2023 systems
Ozone impactZero ozone depletion
Current price$20-$50 per lb
GWP2,088
Phase-out by 2025
R-32
Single component refrigerant
TypeHFC (hydrofluorocarbon)
Used inMini-splits, newer units
Ozone impactZero ozone depletion
Current price$15-$30 per lb
GWP675 (67% less than R-410A)
Currently approved
R-454B
Also known as Puron Advance
TypeHFO blend
Used inNew systems from 2025+
Ozone impactZero ozone depletion
Current price$30-$60 per lb
GWP466 (78% less than R-410A)
New standard 2025
R-407C
R-22 retrofit alternative
TypeHFC blend
Used inOlder systems retrofitted from R-22
Ozone impactZero ozone depletion
Current price$25-$45 per lb
GWP1,774
Being phased out
Common failures
Parts that fail most often
In Dallas summers, HVAC systems run harder than almost anywhere in the US. These are the parts that wear out fastest and what to watch for.
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Compressor
Failure rate: Very high in TX heat
The heart of the AC system. Pumps refrigerant through the system. Most expensive part to replace. Dallas summers push compressors to their limits.
Warning signs
  • AC blowing warm air
  • Loud banging or clicking noise
  • Hard starting or not turning on
  • Circuit breaker tripping
Replacement cost$800 - $2,500
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Capacitor
Failure rate: Extremely common
Provides the electrical boost to start motors. Capacitors fail frequently in Texas due to extreme heat. Usually the first thing to check when AC stops working.
Warning signs
  • AC won't start or struggles to start
  • Humming sound with no cooling
  • AC shuts off shortly after starting
  • Higher energy bills
Replacement cost$120 - $300
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Condenser Fan Motor
Failure rate: High in summer
Pulls air through the outdoor condenser coils. When it fails, the system overheats and shuts down. Very common failure during Dallas heat waves.
Warning signs
  • Outdoor fan not spinning
  • System overheating and shutting off
  • Grinding or squealing noise outside
Replacement cost$250 - $600
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Evaporator Coil
Failure rate: Moderate
Located inside the air handler, absorbs heat from indoor air. Can freeze up from dirty filters or refrigerant issues. Leaks are common in older systems.
Warning signs
  • Ice forming on indoor unit
  • Water leaking from air handler
  • Weak airflow from vents
  • Warm air despite running
Replacement cost$600 - $2,000
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Contactor
Failure rate: Common
Electrical switch that controls power to the compressor and fan. Contactors get pitted and burned over time, causing intermittent operation or complete failure.
Warning signs
  • AC won't turn on at all
  • Chattering or buzzing from outdoor unit
  • Constant running without cycling off
Replacement cost$100 - $300
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Thermostat
Failure rate: Moderate
Controls when the system runs. Old thermostats lose calibration. Smart thermostats can fail due to wiring issues or software problems.
Warning signs
  • Temperature doesn't match setting
  • System won't turn on or off
  • Blank or unresponsive display
  • Short cycling
Replacement cost$80 - $350
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Blower Motor
Failure rate: Moderate
Circulates conditioned air through the ductwork. When it fails, air stops moving through your home even though the AC is running.
Warning signs
  • No airflow from vents
  • Weak airflow despite running
  • Squealing or rattling sounds from indoor unit
  • Overheating system
Replacement cost$300 - $700
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Drain Line / Pan
Failure rate: Very common in TX
Removes condensation from the evaporator coil. Dallas humidity means AC units produce a lot of water. Clogs cause water damage and mold.
Warning signs
  • Water pooling around indoor unit
  • Musty smell from vents
  • System shutting off unexpectedly
  • Water stains on ceiling
Cleaning / repair cost$75 - $250
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Reversing Valve
Failure rate: Low but expensive
Found only in heat pumps. Switches the system between heating and cooling mode. When it fails, the system gets stuck in one mode.
Warning signs
  • Heat pump only heats or only cools
  • Hissing sound from outdoor unit
  • Refrigerant bypassing the system
Replacement cost$400 - $1,200
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Air Filter
Failure rate: 100% — always needs replacing
Protects the entire system from dust and debris. A clogged filter is the #1 cause of HVAC problems. In Dallas dust and pollen season, filters clog faster.
Warning signs
  • Reduced airflow from vents
  • Ice on the evaporator coil
  • Higher energy bills
  • More dust than usual in home
Replacement cost$5 - $30 (every 1-3 months)
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Control Board
Failure rate: Low but costly
The brain of the system. Coordinates all components. Power surges from Texas storms are a common cause of control board failure in DFW.
Warning signs
  • Erratic system behavior
  • Components not responding
  • Error codes on thermostat
  • System dead after power surge
Replacement cost$200 - $700
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Refrigerant (low charge)
Failure rate: Common in older systems
Low refrigerant almost always means a leak. It doesn't get used up — it escapes. In Texas heat, a system low on refrigerant can destroy the compressor quickly.
Warning signs
  • AC runs constantly but home stays warm
  • Ice on refrigerant lines
  • Hissing or bubbling sound
  • Higher electric bills
Recharge + leak repair$200 - $1,500
Dallas specific
HVAC tips for Dallas homeowners
The DFW climate is brutal on HVAC systems. These tips are specific to our local conditions.
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Set it at 78°F, not lower
Every degree below 78°F increases energy use by 6-8%. In Dallas summers, setting it at 72°F costs nearly double compared to 78°F.
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Change filters every 30 days
Dallas pollen, dust, and humidity clog filters fast. Most homes need filter changes every 30 days in summer, not 90 as the package says.
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Clear 2 feet around outdoor unit
Grass, shrubs, and debris block airflow to the condenser. In Texas heat, restricted airflow can overheat and kill the compressor within hours.
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Service before June, not during
Schedule your annual HVAC tune-up in April or May. By June every HVAC tech in DFW is booked. Don't wait until it breaks in July heat.
⛈️
Install a surge protector
Dallas storms cause frequent power surges. A whole-home surge protector ($200-400 installed) can save your HVAC control board and compressor from a $2,000+ repair.
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Flush the drain line monthly
Pour a cup of diluted bleach down your condensate drain line monthly in summer. Dallas humidity makes your AC produce gallons of water per day — clogs happen fast.

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