My lease specifically excludes the refrigerator, and washer and dryer, i.e. not part of the rent. Further, it states that repair and maintenance is on the tenant.
That being said, I've replaced refrigerators and washer and dryers for tenants and usually do so without even reminding the tenant about that clause that they didn't remember or forgot they agreed to. However, I have, on two occasions, pointed to the clause and told different tenants I wouldn't replace the refrigerator. One I offered to pay 50% up to $125 for a service call and they opted to buy their own. The other I didn't offer anything. In both situations, it was going to be a nonrenewal of lease situation at the end of the lease for tenants I wanted gone.
Personally, I've been toying with the idea of no longer providing them, except as a rental option. $15-$20 a month depending on the appliance. The reason is, more than half my tenants end up bringing their own and I get tired of hauling the unneeded ones in and out.