SUMIF doesnt sum, where COUNTIF does count

Hi,

sheet 1, named INPUT:

row C - times (in plain number format, i.e. 1500 for 15:00)
row P - values i need to sum (numbers)
row C - category (words)

sheet 2, named STATS:

I need to achieve a table where header looks like this:
Header: Time From (H) / Time Till (I) / count / sum / volume per category A / volume in category B /
Example: 1500 / 1530 / ??? / ??? / ??? / ???

as for the count, I am doing alright by:

=COUNTIFS(INPUT!C14:C2001;">="&H65;INPUT!C14:C2001;"<="&I65)

but the plain sum returns 0 when like this:

=SUMIFS(INPUT!$P$14:$P$2000;INPUT!$C$14:$C$2000;"=>"&$H66;INPUT!$C$14:$C$2000;"=<"&$I66)

the first period where i only need one criteria works fine with:

=SUMIF(INPUT!C14:C2001;"<=" &I65;INPUT!P14:P2000)

What I ask for:
It doesnt have to be achieved with SUMIF, I was wondering about SUMPRODUCT but I am not familier with it and it seems to me I am just missing a small syntax fix with the SUMIF formula.

thanks,
Jirka