Hello, looking for some help with an assembly code loop, thanks

the loop is, in a high level language:

While True
If Temp <10
Then close Windows
Else open Windows
End If
End While


the problem is, if I want to close the windows I have to set the first bit of the memory location 'House' to 0, without disturbing any other bits.

if i use the assembly code:

LDA 0
ST House

that will ruin the rest of the byte of data. how can I refer to one bit of memory?

any help is great, thanks

Will

jmp @F
again:
cmp dword ptr [Temp],0Ah
jae no
;close windows
jmp @F
no:
;open windows
@@:
or eax,eax
jne again