A.C. letters
The crossword clue "A.C. letters" is answered by BTU, a 3-letter entry. Used 7 times across 7 distinct years; most recently in 2019; first recorded in 2000. It appears in 5 publications in the xd corpus. Every figure on this page comes from the collection data itself, never from a guess.
The answer
BTU
3 letters. See every clue for this answer on the BTU answer page.
Used 7 times across 7 distinct years; most recently in 2019; first recorded in 2000. It appears in 5 publications in the xd corpus. Frequency and last-seen figures come from the xd crossword corpus only.
Other clues for BTU
Every other clue in this collection answered by BTU, most used first.
- A/C measure - used 76 times, most recently in 2026
- Heat meas. - used 35 times, most recently in 2025
- A/C meas. - used 31 times, most recently in 2026
- A/C stat - used 31 times, most recently in 2025
- HVAC measure - used 25 times, most recently in 2026
- A/C unit - used 24 times, most recently in 2024
- AC measure - used 21 times, most recently in 2026
- Air conditioner meas. - used 17 times, most recently in 2022
- AC meas. - used 11 times, most recently in 2026
- AC unit - used 11 times, most recently in 2025
Related clues
Clues in this collection of the same answer length that share a word with this clue, or match its answer pattern when no word is shared. Most used first.
- Genetic letters - RNA, used 265 times
- Debtor's letters - IOU, used 249 times
- Explosive letters - TNT, used 225 times
- Letters before an alias - AKA, used 194 times
- Alias letters - AKA, used 146 times
- Battleship letters - USS, used 124 times
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