Our upstairs is carpeted.  I can't quite get to all the
vacuuming I should do (caregiver for two parents, 83 and 91;
some days, the housework slides a bit).  We have thought some of
re-doing with tile and washable area rugs.  (But I'd hate to
have anything but a carpeted stairway.)

Another problem is that we have forced hot-air heating.  I never
would have adopted an asthmatic cat if he hadn't already been at
the shelter for months and about used up his time.  (Actually,
there was zero chance of my not bringing him home; they didn't
tell me he was asthmatic until *after* I was hooked.)

This week I had non-feline health problem which took some of my
time, so I'm slow in returning to this thread.  Thanks to
everyone for your comments.  It seems that you all pretty much
agree that two months spacing is minimum for injected steroids,
and longer would be better.  Since the five weeks relief that
Will gets from his injections is *above* average, that means, in
most cases, that this therapy can cover only about half the
time.  So far, it's the only therapy my vet has even suggested
to me.

I like the vet clinic I'm with now, and it's only five minutes
from home.  But they may not be the greatest at treating asthma.
The one time I suggested we think about inhaled medications, I
got a pretty blank look.  Still, I think at this point I'd
better study up on it so I can present a good argument.  If one
of the vets there wants to join me in learning as we go, that
will be fine; if not, I may have to go vet shopping.  Of course,
if I could find a vet who is already knowledgeable and
experienced with inhaled therapy, that would be the easiest for
me.