You may have 21 H's!

In s-eet fields -f a-t--n
The --ld lea-es are fallin-
The d--s -ar- and -hase the-
Th---h their -asters are -allin-

The -ats sit -n -ind--sills
And ta-e in the -ar- s-nshine
All the --rses -r-- their hea-- --ats
T- prepare f-r --ld -interti-e

All the d--s, -ats, -irds and --nnies
That -e all l--e and treas-re
Are s- -lad f-r their -ar- h--es, n--,
-hen n-rth -ind -rin-s --ld -eather

Letters left to choose from:
BCDGJKMOQRUVWXYZ

Dixieland Dancer: E(37) A(29) R(23) T(27)= 182
zippy-kat : I(18) D(14) P(2) S(24) L(19) H(21) = 114
Fuzzy317: N(21) F(6)=26