Page 1 of 54
EPA 608 CERTIFICATION 2026 EXAM
COMPLETE 240 CURRENT TESTING
QUESTION AND DETAILED CORRECT
ANSWER (VERIFIED) TOP-RATED A+.
EPA 608
Ace your EPA 608 Certification Exam by mastering safe
refrigerant handling, leak repair, and environmental regulations
for HVAC/R systems. This exam evaluates your knowledge of
laws and procedures designed to protect the ozone layer during
equipment servicing. It is specifically designed to certify
technicians for legally purchasing and managing refrigerants.
Are there drop-in replacements for R-12 systems? Why or
why not? ✓ ✓...... ANSWER ....... No because the
new refrigerants are incompatible with the oils and
lubricants used in R-12 systems.
What type of oil is used in R-134a and what oils will it mix
with? ✓ ✓...... ANSWER ....... Ester based oils and
they do not mix with other oils
, Page 2 of 54
What type of lubricant is used with HCFCs? ✓ ✓......
ANSWER ....... Alkylbenzene lubricant
What is difference b/w ternary blend a azeotropic blend? ✓
✓...... ANSWER ....... Ternary blends are three-part
mixtures whereas azeotropic blends are blends of two or
more compounds that act like a single compound.
What is the trait of a hygroscopic lubricant? ✓ ✓......
ANSWER ....... It absorbs (takes on) moisture
What is temperature glide and what type of blend won't have
it? ✓ ✓...... ANSWER ....... Temp. blend is the
difference between the dew point and the bubble point
Dew Point ✓ ✓...... ANSWER ....... Occurs when
saturation temp in evaporator causes refrigerant to change
from liquid to vapor
Bubble Point ✓ ✓...... ANSWER ....... Occurs when
saturation temp in condenser changes refrigerant from
vapor to liquid
, Page 3 of 54
Will the gases in a ternary blend leak at the same rate? Why
or why not? ✓ ✓...... ANSWER ....... No because
different refrigerants in blend have different vapor pressures,
causing them to leak at uneven rates
Refrigeration Process ✓ ✓...... ANSWER .......
transfer of heat from one place to another
Evaporator ✓ ✓...... ANSWER ....... Absorbs heat into
system from space to be cooled. Absorption of heat causes
refrigerant to boil. Upon leaving, refrigerant changed to low
pressure, low temperature vapor
Compressor ✓ ✓...... ANSWER ....... Takes low
pressure, low temp vapor and changes it to a high-temp,
high-pressure, superheated vapor and delivers it to the
condenser
Condenser ✓ ✓...... ANSWER ....... Rejects heat from
system and changes refrigerant from high-temp, high-
pressure vapor into high-pressure, high-temp liquid
, Page 4 of 54
Metering Device ✓ ✓...... ANSWER ....... reduces
pressure of refrigerant and changes the high-pressure, high-
temp liquid into low pressure, low temp liquid.
Compound Gauge ✓ ✓...... ANSWER ....... Typically
blue and measures low pressure (psig) and vacuum (inHg).
High Pressure Gauge ✓ ✓...... ANSWER ....... Red
and measures high side (discharge) pressure. 0 to 500 psi
What does a compressor compress? ✓ ✓...... ANSWER
....... Vapor
Why will refrigerant migrate to the crankcase in a
compressor? ✓ ✓...... ANSWER ....... Because of the
vapor pressure difference between refrigerant and oil
What color is the high pressure gauge? ✓ ✓...... ANSWER
....... Red
EPA 608 CERTIFICATION 2026 EXAM
COMPLETE 240 CURRENT TESTING
QUESTION AND DETAILED CORRECT
ANSWER (VERIFIED) TOP-RATED A+.
EPA 608
Ace your EPA 608 Certification Exam by mastering safe
refrigerant handling, leak repair, and environmental regulations
for HVAC/R systems. This exam evaluates your knowledge of
laws and procedures designed to protect the ozone layer during
equipment servicing. It is specifically designed to certify
technicians for legally purchasing and managing refrigerants.
Are there drop-in replacements for R-12 systems? Why or
why not? ✓ ✓...... ANSWER ....... No because the
new refrigerants are incompatible with the oils and
lubricants used in R-12 systems.
What type of oil is used in R-134a and what oils will it mix
with? ✓ ✓...... ANSWER ....... Ester based oils and
they do not mix with other oils
, Page 2 of 54
What type of lubricant is used with HCFCs? ✓ ✓......
ANSWER ....... Alkylbenzene lubricant
What is difference b/w ternary blend a azeotropic blend? ✓
✓...... ANSWER ....... Ternary blends are three-part
mixtures whereas azeotropic blends are blends of two or
more compounds that act like a single compound.
What is the trait of a hygroscopic lubricant? ✓ ✓......
ANSWER ....... It absorbs (takes on) moisture
What is temperature glide and what type of blend won't have
it? ✓ ✓...... ANSWER ....... Temp. blend is the
difference between the dew point and the bubble point
Dew Point ✓ ✓...... ANSWER ....... Occurs when
saturation temp in evaporator causes refrigerant to change
from liquid to vapor
Bubble Point ✓ ✓...... ANSWER ....... Occurs when
saturation temp in condenser changes refrigerant from
vapor to liquid
, Page 3 of 54
Will the gases in a ternary blend leak at the same rate? Why
or why not? ✓ ✓...... ANSWER ....... No because
different refrigerants in blend have different vapor pressures,
causing them to leak at uneven rates
Refrigeration Process ✓ ✓...... ANSWER .......
transfer of heat from one place to another
Evaporator ✓ ✓...... ANSWER ....... Absorbs heat into
system from space to be cooled. Absorption of heat causes
refrigerant to boil. Upon leaving, refrigerant changed to low
pressure, low temperature vapor
Compressor ✓ ✓...... ANSWER ....... Takes low
pressure, low temp vapor and changes it to a high-temp,
high-pressure, superheated vapor and delivers it to the
condenser
Condenser ✓ ✓...... ANSWER ....... Rejects heat from
system and changes refrigerant from high-temp, high-
pressure vapor into high-pressure, high-temp liquid
, Page 4 of 54
Metering Device ✓ ✓...... ANSWER ....... reduces
pressure of refrigerant and changes the high-pressure, high-
temp liquid into low pressure, low temp liquid.
Compound Gauge ✓ ✓...... ANSWER ....... Typically
blue and measures low pressure (psig) and vacuum (inHg).
High Pressure Gauge ✓ ✓...... ANSWER ....... Red
and measures high side (discharge) pressure. 0 to 500 psi
What does a compressor compress? ✓ ✓...... ANSWER
....... Vapor
Why will refrigerant migrate to the crankcase in a
compressor? ✓ ✓...... ANSWER ....... Because of the
vapor pressure difference between refrigerant and oil
What color is the high pressure gauge? ✓ ✓...... ANSWER
....... Red
