HVAC Trivia
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This HVAC trivia quiz has 98 free questions with answers and covers heating, ventilation and air conditioning from the Roman hypocaust and Franklin's 1742 stove to Nest thermostats and variable refrigerant flow. You will meet Willis Carrier and the Brooklyn print shop that got the first modern air conditioner, John Gorrie's 1851 ice-machine patent, Frederick McKinley Jones and Thermo King, the Frigidaire chemists behind Freon and the treaty that phased it out. The technical rounds cover the four parts of the refrigeration cycle, why a 'ton' of cooling is 12,000 BTU per hour, what SEER, AFUE and MERV actually measure, how a heat pump reverses, and which refrigerants replaced R-22. It is built for HVAC technicians and apprentices, EPA 608 candidates who want a break from the study guide, trade-school instructors, and anyone hosting a contractor team night or a facilities-management social. Easy questions ask which coil absorbs heat and where a hypocaust sent its hot air; the hard ones ask who built the first heat pump and which London hall was warmed by the Thames in 1951. Every answer has been checked against Wikipedia, the EPA, and the Carrier archive, and each question shows its citation once you have answered.
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Q 01Willis Carrier was a research engineer at which firm when he designed the first modern air conditioner in 1902?
Buffalo Forge
Buffalo Forge hired Carrier straight from Cornell in 1901; when it shut its air-conditioning arm in 1914, he and six colleagues left to found the company that still bears his name.
Q 02Which North Carolina textile-mill engineer coined the term 'air conditioning' in 1906?
Stuart W. Cramer
Stuart W. Cramer coined 'air conditioning' in 1906 for his way of adding moisture to mill air, which made cotton yarn easier to spin and less likely to break; Willis Carrier's firm later took up the phrase.
Q 03Willis Carrier's first air-conditioning system, installed in 1902, controlled humidity for what kind of Brooklyn business?
A printing plant
A printing plant: at Sackett & Wilhelms, humid summer air made the paper wrinkle and swell between press runs so coloured inks no longer lined up, and Carrier's machine was built to steady the air for the presses.
Q 04Carrier's company moved to which place in upstate New York, where a university's domed stadium bore its name?
Syracuse
Syracuse let Carrier pull together factories scattered across four cities; decades later the firm's gift put its name on Syracuse University's stadium, the Carrier Dome.
Q 05Which machine did Willis Carrier unveil in May 1922, opening the door to cooling large buildings such as theatres?
The centrifugal chiller
The centrifugal chiller had fewer moving parts and compressor stages than the machines before it, so big cooling systems became cheaper and more reliable and comfort cooling spread quickly to large public buildings.
Q 06Where was the Rivoli Theatre, the grand cinema that Carrier air-conditioned in the 1920s?
New York City
New York City's Rivoli was a movie palace off Times Square; for many Americans in the 1920s, a cinema like it was the first place they ever felt mechanically cooled air.
Q 07Which automaker was the first to offer an air-conditioning unit in its cars, in 1939?
Packard
Packard's unit put its cooling coil and blower in the boot, taking up half the trunk, and the compressor ran whenever the engine did; with no clutch to disengage it, stopping the cold meant removing the drive belt.
Q 08In 1931 H.H. Schultz and J.Q. Sherman developed the most common type of which appliance, early models costing $10,000 to $50,000?
Room air conditioner
The room air conditioner sat on a window ledge; early units cost several times the price of a house at the time.
Q 09John Gorrie patented an ice-making machine in 1851 in the fever-prone Florida port of Apalachicola; what was his profession?
Physician
Physician John Gorrie built the machine to cool the rooms of his fever patients; he died financially ruined in 1855, yet Florida later chose his statue to represent the state in the US Capitol.
Q 10In which country did newspaperman James Harrison build an early refrigeration works in the 1850s, before trying to export frozen meat?
Australia
Australia's Geelong was where Harrison ran a newspaper; in 1873 he loaded the ship Norfolk with frozen beef and mutton for Britain, but the cargo spoiled on the voyage.
Q 11Frederick McKinley Jones, who invented refrigeration units for trucks, co-founded which company with Joseph Numero?
Thermo King
Thermo King began as the U.S. Thermo Control Company; Jones's units carried fresh food to troops in the Second World War and afterwards changed how groceries were shipped, letting perishables travel long distances by road.
Q 12In 1991 Frederick McKinley Jones posthumously became the first African American to receive which honour?
National Medal of Technology
The National Medal of Technology was presented to Jones's widow by President George H.W. Bush, 30 years after the inventor's death; he shared the award with his business partner, Joseph Numero.
Q 13In an air conditioner, liquid refrigerant absorbs heat from indoor air as it passes through which component?
Q 21Which hydrocarbon became the main refrigerant in European household refrigerators after Greenpeace championed it in the 1990s?
Isobutane
Isobutane, coded R-600a, was part of the hydrocarbon coolant in the Greenfreeze fridge that Greenpeace launched in 1993 with an East German manufacturer, built to show that refrigerators did not need fluorocarbons at all.
Q 22A 'ton' of cooling capacity is defined as how many BTU per hour?
12,000
One ton of cooling is 12,000 BTU per hour, roughly what a 500-square-foot room needs; going bigger backfires, because an oversized unit cools the air before it has had time to remove the humidity, leaving the room clammy.
Q 23The 'ton' used to rate air conditioners originally compared a machine's cooling over a day with a ton of what?
Ice
Evaporator
The evaporator coil runs cold enough for moisture in the air to condense on it, so an air conditioner also works as a dehumidifier.
Q 14Which refrigeration-cycle component is also known as the metering device?
Expansion valve
The expansion valve (or a capillary tube) is the metering device; it creates the pressure drop that lets refrigerant flash into a cold, low-pressure mist just before it enters the indoor coil.
Q 15Freon was developed in the late 1920s as a safer refrigerant by researchers at which company, then the owner of Frigidaire?
General Motors
General Motors set its researchers to find a non-toxic, non-flammable replacement for the ammonia and sulfur dioxide that made early fridges dangerous, then formed a joint company with DuPont in 1930 to produce it.
Q 16Which inventor helped create both leaded petrol and the first CFC refrigerants?
Thomas Midgley Jr.
Thomas Midgley Jr. died in 1944; decades later both of his inventions were phased out worldwide for the harm they did to human health and the ozone layer.
Q 17Which agreement, signed in 1987, was among the first treaties ever ratified by every United Nations member state?
Montreal Protocol
The Montreal Protocol phased out the CFCs once standard in fridges and air conditioners; a UN-backed assessment in 2023 found the ozone layer on track to recover within about four decades.
Q 18The 2016 Kigali Amendment phases down which class of refrigerants, adopted widely as replacements for ozone-damaging CFCs?
HFCs
HFCs spare the ozone layer but are potent greenhouse gases, so the amendment turned an ozone treaty into a climate one: cutting them 80 to 85 percent by the late 2040s should avoid up to 0.5 °C of warming by 2100.
Q 19Which two chemists predicted in 1974 that CFCs would deplete the ozone layer?
Molina and Rowland
Molina and Rowland published their warning in Nature in 1974 and met heavy criticism, but later measurements showed they had, if anything, underestimated the risk; they shared the 1995 Nobel Prize in Chemistry with Paul Crutzen.
Q 20When R-22 was restricted in the 2010s, most new US home ACs shifted to which refrigerant?
R-410A
R-410A, sold as Puron, spared the ozone layer but proved a potent greenhouse gas, so US rules in turn barred it from new home systems from 2025.
Ice was what people cooled with before machines, so early refrigeration machines were rated by how many tons of melting ice a day they could match, and the unit stuck.
Q 24A British thermal unit is the heat needed to raise how much water by one degree Fahrenheit?
One pound
One pound of water warmed by one degree Fahrenheit defines the BTU, roughly the heat of one burning kitchen match; a single unit is so small that US natural gas is priced by the million.
Q 25In 2006 US rules raised the lowest rating for new central air conditioners from 10 to 13 on which scale?
SEER
SEER, the seasonal energy efficiency ratio, divides a summer's cooling output by the electricity used; moving from 10 to 13 cut the power needed for the same cooling by nearly a quarter.
Q 26In the furnace efficiency rating AFUE, what does the letter A stand for?
Annual
Annual, because AFUE (Annual Fuel Utilization Efficiency) averages a furnace over a whole heating season, start-ups and cool-downs included, rather than quoting its best steady-state figure.
Q 27High-efficiency condensing furnaces are vented with PVC pipe rather than metal to prevent what?
Corrosion
The acidic condensate would corrode metal flue pipe; a condensing furnace's secondary heat exchanger pulls so much heat from the exhaust that water vapour condenses out, so plastic venting prevents corrosion.
Q 28Which component makes a heat pump different from an air conditioner, letting it both heat and cool a home?
Reversing valve
The reversing valve flips the direction the refrigerant flows, so the outdoor coil that dumps heat in summer gathers it in winter and one machine does both jobs.
Q 29Which London venue opened in 1951 with a reversible water-source heat pump fed by the River Thames?
Royal Festival Hall
The Royal Festival Hall's heat pump was driven by two Rolls-Royce Merlin aircraft engines converted to burn town gas; it worked, but it was taken out once the Festival of Britain was over.
Q 30A pioneering 1948 heat pump drawing warmth from groundwater was installed in the Commonwealth Building in which Pacific Northwest city?
Portland, Oregon
Portland, Oregon's Commonwealth Building was a sealed tower with no opening windows, so even in a mild climate it needed air conditioning, and its heat pumps supplied both the heating and the cooling.