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NATE_HEATPUMP_SERVICE NEC 2023

NATE Heat Pump Service Practice Test 5

This practice test focuses on balance point and how a heat pump's heating capacity changes with outdoor temperature. You will review how heat loss, equipment sizing, and climate affect when auxiliary heat is needed. A few questions on emergency heat and dual-fuel systems are mixed in for review.

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NATE Heat Pump Service

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Frequently Asked Questions

Yes — completely free with no signup required. Every question includes a full explanation of the correct answer.

Two: the NATE Core exam plus at least one specialty exam (for example AC Service, Heat Pump Service, or Air Distribution Service). You can take them on the same day or separately.

The Core exam has 50 questions and each installation or service specialty exam has 100 questions. You need 70% on each to pass — 35 of 50 on Core and 70 of 100 on a specialty. Check natex.org for the current format before you book.

NATE certification lasts two years. To renew, you submit 16 hours of continuing education or retake the specialty exam before your certification expires.

No. These are independent practice tests written to match the published NATE exam topics. They are not official NATE exam questions.

Exam Tip: Balance point is simply where heat pump output meets home heat loss. Below that point, the gap has to be filled by auxiliary heat.

30

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30 min

Time

70%

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NATE Heat Pump Service Practice Test 5 — Question List

Question 1: What happens to a heat pump's heating capacity as outdoor temperature drops?

It generally decreases, since there is less available heat to extract from colder air
It stays exactly the same regardless of outdoor temperature
It always increases as it gets colder
It only changes if the compressor is replaced

Question 2: What is the balance point of a heat pump system?

The point where refrigerant charge is perfectly balanced
The outdoor temperature where the heat pump's heating capacity equals the building's heat loss
The temperature where the reversing valve switches automatically
The midpoint between SEER and HSPF ratings

Question 3: Below the balance point, what typically happens?

The heat pump shuts off completely
The reversing valve fails
Auxiliary heat is needed to help maintain the thermostat setpoint
The compressor doubles its speed automatically

Question 4: A home has a heat loss of 40,000 BTU/h at 20 degrees Fahrenheit outdoor temperature. At that same temperature, the heat pump can only deliver 28,000 BTU/h. Is the home above or below its balance point at 20 degrees?

Above the balance point, since the heat pump covers the load
Exactly at the balance point
It cannot be determined from this information
Below the balance point, since the heat pump's capacity is less than the home's heat loss

Question 5: A home loses 800 BTU/h for each °F of difference between indoor and outdoor temperature. With a 70°F indoor setpoint, what is the heat loss at 30°F outdoors?

24,000 BTU/h
56,000 BTU/h
32,000 BTU/h
800 BTU/h

Question 6: Which factor directly affects a home's balance point?

The indoor blower speed
The home's heat loss characteristics, such as insulation and window quality
The brand of the compressor only
The thermostat's setpoint schedule only

Question 7: As outdoor temperature drops further below the balance point, what generally happens to the amount of auxiliary heat needed?

It decreases
It stays exactly the same
It typically increases, since the gap between heat pump capacity and heat loss grows larger
It becomes unnecessary

Question 8: Why does a heat pump's heating capacity drop in colder weather?

The refrigerant automatically leaks out in cold weather
The reversing valve switches to cooling mode permanently
The crankcase heater shuts off the compressor
There is less available heat in colder outdoor air for the system to extract

Question 9: A heat pump sized correctly for a mild climate is installed in a much colder climate without resizing. What is a likely result regarding its balance point?

The balance point will likely be reached at a relatively mild outdoor temperature, requiring more auxiliary heat use than expected
The balance point will never be reached in that climate
The system will no longer need a reversing valve
The system's SEER rating will increase automatically

Question 10: Why do some heat pumps in very cold climates use a low-ambient compressor lockout?

To stop the reversing valve from sticking when it shifts in very cold weather
Below a set outdoor temperature, compressor capacity and efficiency are too low, so backup heat takes over
To keep defrost from running, since frost cannot form below about 0°F
Because refrigerant stops flowing through the outdoor coil below about 32°F

Question 11: Which of these would tend to lower (make colder) a home's balance point, meaning less auxiliary heat is needed overall?

Poor insulation and old, leaky windows
An undersized heat pump
Good insulation and an appropriately sized, efficient heat pump
A higher thermostat setpoint

Question 12: How do cold-climate heat pumps with variable-speed (inverter) compressors keep more heating capacity at low outdoor temperatures?

They switch to a lower-pressure refrigerant blend during winter operation
They stop defrosting below freezing, so the coil stays fully open
They hold the reversing valve halfway between modes to mix hot gas in
The compressor speeds up to move more refrigerant as the outdoor temperature drops

Question 13: How does proper equipment sizing relate to the balance point?

A properly sized heat pump for the local climate will have a balance point that minimizes unnecessary auxiliary heat use
Equipment sizing has no effect on balance point
Balance point depends only on refrigerant type, not equipment size
Larger equipment always raises the balance point

Question 14: A heat pump delivers 30,000 BTU/h of heat at 30 degrees Fahrenheit outdoor temperature, exactly matching the home's heat loss at that temperature. What does this tell us?

The home is well above its balance point at 30 degrees
30 degrees Fahrenheit is approximately the balance point for this home and equipment combination
The heat pump is malfunctioning
Auxiliary heat is unnecessary at any outdoor temperature

Question 15: Which of the following best relates balance point to a dual-fuel system?

Balance point does not apply to dual-fuel systems
In dual-fuel systems, the balance point always equals exactly 32 degrees Fahrenheit
Dual-fuel systems often use a similar temperature-based switch point to decide when to use the gas furnace instead of the heat pump
Balance point only matters for cooling mode in dual-fuel systems

Question 16: A technician notices auxiliary heat engaging at a much milder outdoor temperature than expected for a given home. What could this suggest?

The system is performing better than expected
The balance point has dropped to a colder temperature than design
The reversing valve is stuck in cooling mode
The heat pump's actual heating capacity has fallen below its rated capacity, possibly due to low refrigerant charge or other performance issues

Question 17: Why is understanding the balance point useful when explaining energy bills to a customer?

It helps explain why auxiliary (often less efficient) heat use, and therefore cost, increases in colder weather
It has no connection to energy bills
It only affects the cooling season bill
It determines the exact price of electricity in their area

Question 18: At which two standard outdoor temperatures does AHRI rate heat pump heating capacity, which are often used to plot the balance point?

65°F and 32°F
47°F and 17°F
95°F and 82°F
32°F and 0°F

Question 19: A homeowner in a cold climate complains about high winter electric bills. After inspection, the technician finds the heat pump is undersized for the home. How does this relate to balance point?

Undersizing has no relationship to balance point
Undersizing would lower the balance point, reducing aux heat use
Undersizing would likely raise the balance point to a milder temperature, causing more frequent and costly auxiliary heat use
Undersizing only affects cooling season costs

Question 20: A home's heat loss at a given outdoor temperature is 25,000 BTU/h. The heat pump's output at that same temperature is also 25,000 BTU/h. Is auxiliary heat needed at this exact outdoor temperature?

Yes, always needed regardless of matching output
Yes, but only during defrost
It cannot be determined
No, at this point the heat pump output matches the load, so this is essentially the balance point and no auxiliary heat is needed yet

Question 21: What generally happens to a heat pump's heating capacity as outdoor temperature rises (gets warmer) in winter?

It generally increases, since more heat is available in the outdoor air
It generally decreases
It has no relationship to outdoor temperature
It only changes with humidity, not temperature

Question 22: Which term describes the outdoor temperature threshold that determines the switch to the gas furnace in a dual-fuel system?

Superheat point
Switch-over point (often similar in concept to the balance point)
Saturation point
Subcooling point

Question 23: A technician is sizing a new heat pump for a home. Why is knowing the home's heat loss at design outdoor temperature important for balance point planning?

It has no bearing on balance point
It only matters for cooling equipment sizing
It helps predict how much auxiliary heat capacity will likely be needed in the coldest expected weather
It determines the size of the line set

Question 24: A technician reviews two identical homes in the same climate: Home A has a properly sized heat pump, Home B has an undersized heat pump. Which home will likely rely on auxiliary heat more often throughout the winter?

Home A, because larger equipment always uses more aux heat
Both homes equally, since climate is the same
Neither home, since balance point does not apply here
Home B, since its undersized heat pump will reach its balance point at a milder outdoor temperature

Question 25: Which of these is NOT a factor in determining a home's balance point?

The color of the outdoor unit's cabinet
The home's insulation levels
The heat pump's rated heating capacity at various temperatures
The home's heat loss at various outdoor temperatures

Question 26: A customer asks if raising the thermostat setpoint changes the balance point. What is the best answer?

No, thermostat setpoint has no effect on comfort or heat loss
Yes, indirectly, since a higher setpoint increases the home's heat loss rate, which can effectively raise the balance point
No, balance point is fixed by the compressor model number alone
Yes, but only during the cooling season

Question 27: Which improvement to a home would most likely lower a heat pump's balance point (meaning less aux heat needed)?

Removing attic insulation
Installing older, single-pane windows
Adding attic insulation and sealing air leaks to reduce heat loss
Increasing the number of exterior doors

Question 28: A heat pump delivers 36,000 BTU/h at 47°F and 22,000 BTU/h at 17°F. Assuming a straight line between those points, about what does it deliver at 32°F?

About 22,000 BTU/h
About 36,000 BTU/h
About 58,000 BTU/h
About 29,000 BTU/h

Question 29: Why might a technician recommend a manual J load calculation before installing a new heat pump?

To correctly size the equipment for the home's heat loss, helping set an appropriate balance point and minimize excess aux heat use
To determine the refrigerant charge required
To calculate the homeowner's thermostat password
To measure outdoor humidity only

Question 30: A heat pump has strong published efficiency in mild climates but is installed in a very cold climate instead. What does this likely mean for the balance point?

The balance point will not be affected by climate severity
The balance point is likely to occur at a relatively mild outdoor temperature, meaning more reliance on auxiliary heat in that climate
The balance point will always match a rating number exactly
Efficiency ratings have no connection to balance point at all

EXAM CARD NATE_HEATPUMP_SERVICE

Questions30

Time limit30 min

Pass score70%

Code editionNEC 2023

DifficultyIntermediate

Last reviewedJun 2026

Timer starts immediately. Progress is auto-saved.

Source: NEC 2026 (NFPA 70)