U.S. Air Force · Civil Engineering

3E1X1 Heating, Ventilation, Air Conditioning and Refrigeration

Air Force 3E1X1 (HVAC/R) requires ASVAB line scores of Mechanical (M) 55 and Electronics (E) 45, plus a minimum AFQT of 31 — re-verified 2026-07-01 against the current Air Force HVAC/R career page. HVAC/R technicians install, maintain, and operate the heating, ventilation, air conditioning, and refrigeration systems that keep Air Force buildings, work centers, and electronic equipment climate-controlled. Because Arithmetic Reasoning is the only subtest inside both the Air Force M and E composites, AR is the single highest-leverage area to study for this job (M = VE + AR + AS + MC, E = AR + MK + EI + GS, re-verified 2026-07-23).

last verified 2026-07-01

3E1X1 (Heating, Ventilation, Air Conditioning and Refrigeration) is in the Air Force and requires a minimum AFQT of 31 and M of at least 55 and E of at least 45. Last verified 2026-07-01 against airforce.com HVAC/R Specialist.

Quick check

Can I qualify for this job?

Enter the scores you already know. Leave a box blank if you do not have that score yet.

AFQT minimum 31Enter AFQT
M minimum 55Enter M
E minimum 45Enter E

Plain requirement

What you need.

  • Min AFQT31
  • Training~14 weeks
  • M line score≥ 55
  • E line score≥ 45

AFQT 31 is a percentile. The line scores above are not — they are Air Force composites, weighted sums of your ASVAB subtest standard scores (M = VE + AR + AS + MC; E = AR + MK + EI + GS — per airforce.com (ASVAB — MAGE composites), verified 2026-07-23). Work yours out from your score sheet with the Air Force ASVAB line score calculator.

Source: airforce.com HVAC/R Specialist · last verified 2026-07-01.

Role brief

About 3E1X1 — Heating, Ventilation, Air Conditioning and Refrigeration.

Air Force 3E1X1 (HVAC/R) requires ASVAB line scores of Mechanical (M) 55 and Electronics (E) 45, plus a minimum AFQT of 31 — re-verified 2026-07-01 against the current Air Force HVAC/R career page. HVAC/R technicians install, maintain, and operate the heating, ventilation, air conditioning, and refrigeration systems that keep Air Force buildings, work centers, and electronic equipment climate-controlled. Because Arithmetic Reasoning is the only subtest inside both the Air Force M and E composites, AR is the single highest-leverage area to study for this job (M = VE + AR + AS + MC, E = AR + MK + EI + GS, re-verified 2026-07-23).

Starting pay · 2026

What this job pays as a junior enlisted member.

Base pay is set by pay grade, not by job — every Air Force enlistee at the same grade earns the same monthly base pay. These are the 2026 active-duty rates (3.8% raise, effective 2026-01-01).

GradeRankMonthly base payService
E-1Airman Basic (AB)$2,407after 4 months of service
E-2Airman (Amn)$2,698under 2 years
E-3Airman First Class (A1C)$2,837under 2 years
E-4Senior Airman (SrA)$3,142under 2 years
  • Plus food allowance (BAS)$460/moFlat enlisted rate, tax-free, paid on top of base pay.
  • Plus housing allowance (BAH)Basic Allowance for Housing (BAH) is paid on top of base pay and is tax-free, but it varies by duty-station ZIP code, pay grade, and whether you have dependents — there is no single nationwide figure. Use the official DoD BAH calculator for your assignment location.DoD BAH rate lookup →

Source: DFAS 2026 active-duty basic pay tables (3.8% raise, effective Jan 1 2026) · last verified 2026-05-23 · date retrieved 2026-05-23.

Eligibility notes

What 3E1X1 candidates should check.

  • The current Air Force HVAC/R page lists two ASVAB line-score requirements for 3E1X1: 55 Mechanical (M) and 45 Electronics (E). AFQT 31 is the general Air Force enlistment floor. Re-verified 2026-07-01 against the Air Force HVAC/R career page.
  • How the required scores are built: re-verified 2026-07-23 against the current Air Force ASVAB page, the Mechanical (M) composite = Verbal Expression (VE, i.e. Word Knowledge + Paragraph Comprehension) + Arithmetic Reasoning (AR) + Auto & Shop Information (AS) + Mechanical Comprehension (MC), and the Electronics (E) composite = Arithmetic Reasoning (AR) + Mathematics Knowledge (MK) + Electronics Information (EI) + General Science (GS). Arithmetic Reasoning is the only subtest that feeds both scores 3E1X1 requires, so AR is the highest-leverage ASVAB subtest for this AFSC. Note the correction: General Science counts toward E only — it does not feed the Air Force Mechanical score. Source: airforce.com ASVAB (MAGE composites), verified 2026-07-23.
  • Some older Air Force AFSC line-score charts and third-party lists still show 3E1X1 as M 47 / E 28. The current Air Force HVAC/R career page lists the higher M 55 / E 45; this page uses the current official numbers, re-verified 2026-07-01. Confirm the exact contract minimums with an Air Force recruiter before signing.
  • The Air Force page lists 98 days of technical training for HVAC/R after 7.5 weeks of Basic Military Training; this row rounds the job-specific technical training to about 14 weeks.
  • The same source describes the job as installing, maintaining, and operating heating, ventilation, air conditioning, and refrigeration systems and equipment across Air Force installations. The qualification list includes knowledge of HVAC/R system principles, controls, and components.

What ASVAB score do you need for 3E1X1 Air Force HVAC/R?

The current Air Force HVAC/R Specialist page lists 55 Mechanical (M) and 45 Electronics (E) for AFSC 3E1X1. This page also keeps AFQT 31 as the general Air Force enlistment floor. Source: airforce.com HVAC/R Specialist, re-verified 2026-07-01.

Which ASVAB subtests count toward the Air Force M and E scores for 3E1X1?

The Air Force Mechanical (M) composite comes from Verbal Expression (Word Knowledge + Paragraph Comprehension), Arithmetic Reasoning (AR), Auto & Shop Information (AS), and Mechanical Comprehension (MC). The Electronics (E) composite comes from Arithmetic Reasoning (AR), Mathematics Knowledge (MK), Electronics Information (EI), and General Science (GS). Arithmetic Reasoning is the only subtest feeding both composites 3E1X1 needs (M 55 and E 45), so it is the best single subtest to prioritize. General Science raises E only. Source: airforce.com ASVAB (MAGE composites), verified 2026-07-23.

Is the 3E1X1 ASVAB requirement M 47 / E 28 or M 55 / E 45?

Older AFSC line-score charts list 3E1X1 as M 47 and E 28, but the current Air Force HVAC/R career page lists M 55 and E 45. This page uses the current official numbers (M 55, E 45), re-verified 2026-07-01. AFQT 31 remains the general Air Force enlistment floor.

Does 3E1X1 use the Mechanical or the Electronics ASVAB score?

Use both current Air Force-listed line scores: 55 Mechanical (M) and 45 Electronics (E). If another table gives a different number, verify it against the current Air Force recruiting page before using it.

How long is 3E1X1 HVAC/R technical training?

The Air Force HVAC/R page lists 98 days of technical training after 7.5 weeks of Basic Military Training. This page rounds the job-specific technical training portion to about 14 weeks.

What does Air Force 3E1X1 HVAC/R do?

3E1X1 HVAC/R specialists install, maintain, and operate heating, ventilation, air conditioning, and refrigeration systems and equipment so Air Force facilities and electronic equipment stay climate-controlled.

Source: airforce.com HVAC/R Specialist · last verified 2026-07-01 · date retrieved 2026-07-01.

Nearby targets

Related Air Force score targets.

Related

Practice AFQT plus 3E1X1 line-score subtests.

AFQT + M / E practice targets

Compare Air Force ASVAB requirements

Plan the next step

Independent test-prep — not affiliated with DoD or the ASVAB program. See officialasvab.com for the test program.

Sources