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Start urxvt with a font different from the default 

urxvt -fn "xft:Bitstream Vera Sans Mono:pixelsize=42"

Make it default by inserting the following line into .Xdefaults 

URxvt.font: xft:Bitstream Vera Sans Mono:pixelsize=42

Increase and decrease font size on the fly... usefull for doing screen presentations 

! control + - results in a small font size (10)
URxvt.keysym.C-minus: command:\033]710;xft:Bitstream Vera Sans Mono:pixelsize=10\007
! control + 0 for medium font size (16)
URxvt.keysym.C-0: command:\033]710;xft:Bitstream Vera Sans Mono:pixelsize=16\007
! control + = for a great font size (26)
URxvt.keysym.C-equal: command:\033]710;xft:Bitstream Vera Sans Mono:pixelsize=26\007

or do it manually 

printf '\e]710;%s\007' "xft:Bitstream Vera Sans Mono:pixelsize=26"
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