Verbseoul.
하다 verb (adj)
시원하다siwonhadato be refreshing

To say to be refreshing politely in the present tense, use 시원해요 (shee-wuhn-hae-yoh). Below is the full conjugation of 시원하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
시원해
shee-wuhn-hae
시원해요
shee-wuhn-hae-yoh
시원합니다
shee-wuhn-hahm-nee-dah
Past
시원했어
shee-wuhn-hae-ssuh
시원했어요
shee-wuhn-hae-ssuh-yoh
시원했습니다
shee-wuhn-hae-sseum-nee-dah
Future
시원할 거야
shee-wuhn-hahl- -guh-yah
시원할 거예요
shee-wuhn-hahl- -guh-yae-yoh
시원할 겁니다
shee-wuhn-hahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
시원하세요
shee-wuhn-hah-sae-yoh
Suggestion / Let's Polite (요)
시원해요
shee-wuhn-hae-yoh
Question Polite (요)
시원해요?
shee-wuhn-hae-yoh-?
Connective “and” — (고)
시원하고
shee-wuhn-hah-goh
Conditional “if” — (면)
시원하면
shee-wuhn-hah-myuhn
Noun form — (기)
시원함
shee-wuhn-hahm