It's HOT and the A/C's out!!

I have a 1994 Honda Accord LX that seems to have a freon leak. At about this time last year the A/C started making a funny noise and pretty soon it was blowing hot air alternating with cold air for 30
second intervals. We had the A/C checked out. The mechanic said it was low on freon so he refilled it. He said there might be a leak and to watch it. It worked great all winter and the first half of this summer.
Well, last week it died again, only this time it went out a lot quicker. I'm sure there's a leak somewhere in it.
What is the best action at this point? The car is old and has nearly 200,000 miles. I don't want to spend hundreds on it, but it is very hot now in Utah which makes having no A/C very uncomfortable. I've seen refill kits in the newspaper adds that claim to have leak stopping abilities. Do those work?
I would appreciate any suggestions or words of wisdom.
Thanks
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
If it took a year to go down just add a can of coolant and see if it runs for a while. Or take it in and pay $$$$ to have it fixed. I have had a couple cars that would bleed off over a year. Worked that way for about 10 years...

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.